Regarding Bucharest, here an idea
Intermodal Skateboarding
Get in touch with Kevin Fang. He made this nice proposal for us! 
And he is onto something there. I’ve commuted to work with skateboard + public transport for years. In just about any European metropolis (if you can skate) that will be the fastest, cheapest, and most flexible way to get from A to B. I used to have (good) bikes. I love bikes. But it beats them cold*. You don’t have to lock it (2x3 min saved), you just take it with you where you’re going - trains, planes, buses, bikes. It (almost) never breaks. I have skated daily in wind, rain, snow, sleet, ice, sanded and salted snow (the only one I’d really not recommend). Longboards are fine, but more comfortable and practicable is a relatively big regular one with large soft rolls (important!). They are comfy and quiet + fast and efficient (and you’re less likely to try stupid things that break your bones). Bucharest looks very skateable and like most large cities in the east is graced with a pretty good public transport system - which is key to this intermodal approach. Still, when I moved to the US East coast, I again turned to skating as primary transport - even though the surface generally sucks compared to Europe.
What I would often do in Europe is just get off a couple of stations earlier after work and sometimes skate the last 5-10 km or so. If you’ve done some daily skating that is no distance at all. I’d be going 12-17 km/h depending on the situation. This frees up a place in PT and let’s me interact with the city much, much more intensively**. It is much easier and more likely that I’ll stop and interact (groceries, help someone, etc.) than from a bike basis. Going relatively slow is no problem (at 3-5 km/h it gets tricky again on most surfaces). Plus, I got my hands free to do stuff, unlike on the bike (if you want to live long). Now the suggested next step:
@Noemi Hook up with these nice people (wait for the credits) if you haven’t done so already. They generally have a very can-do attitude, are very enthusiastic, very good “vibe creators”, and have street cred (authority among their peers, i.e. multipliers). In my experience they are also about as flaky and organized as a herd of cats on catnip. So that is the community manager bit.
There are several directions you could push it from there. Either a low level mutual help arrangement (e.g. if you have an event, ideally marching-type) skaters are extremely effective in moving ahead and around the march, engaging bystanders and people walking around. Just give them a t-shirt + backpack (on the belly) full of flyers/info material. Because they are 2-3 times walking speed they can easily cover most of the people there with no sweat. They can also go a few minutes ahead and give out “invitations” to join the march.
You could also try to use them as local stakeholders in city planning/zoning initiatives if you can shake the vandalism stigma that skating often has. For that you probably should recruit more “center authority figures”. My best “5-minute guess” is Duta. You will probably need a relatively well developed plan to get her motivated though. Perhaps you can find someone better, or work with one of her students. One idea for motivation could be a tiny distributed citizen science project leading to a publication. In brief: Some of the skater people go from one location to another and you check the time and modalities, then you use other methods (kickboard, bike, taxi, etc.) to travel and see which one is a promising candidate for future plans. If it goes well you have a basis for applying for all sorts of money to develop this concept further in practice. E.g. a EU sponsored pilot that supplies the (locally sourced - stakeholders) kickboards, skateboards etc. and does some sort of intermodal-to-work program to see what efficiency gains can be achieved and if it is transferable to other beta or gamma or smaller cities. I expect having a bike-share program is too expensive, and not really necessary for most places. This could work better. If you come from the outskirts you ride your bike to the last PT stop (if there’s good surfacing you can directly use kick/skateboard) hop on and do the last mile via kick/skateboard again. Then you do urban-urban and see what the data tells you. Consider that a bike needs some place to stay (and theft may be an issue), and a skateboard needs almost none. This is a large advantage as planners want to create dense urban areas to deal with transport issues and ramp up innovation potential. Doing this with Duta also has the charm that, if this goes well - you can expect that she’ll have an open ear for other small project proposals that she can pitch to bachelor/master students. A wonderful way to get things done!
Lastly if you want more thought on this, I’m of course available for discussion. Especially if this leads to a publication (just put me somewhere between the co-authors).
*OT eyecandy: Always, always, always skate responsibly.
**By the way there’s a couple of movements that may be of interest to be found under this label.