Indeed I love this project and how you are putting together all the loose ends to make something like this work. It’s always a delicate balance to fund and build an alternative system that indeed provides for ones needs; or in other words, it’s hard to find one of the exits from the system (me, still looking for one …). So I wish you all the best success with the transition period!!
I don’t have very specific ideas for your off-grid lifestyle and experimenting … you seem to know how to find all the knowledge you need, anyway. (Still a good spot to plug my Autarky Library of 500 open-access e-books. Quite some about permaculture and homesteading included.)
But still, two things come to mind … maybe one or the other point will be new to you and inspire one or the other experiment:
If you are ready to experiment here as well, check out bottle-to-bottle beekeeping. Controversial, largely unexplored, but promising as it is much simpler than the traditional ways.
This is probably a highly location-specific database for Sri Lanka? Anyway, if you have not seen it already, have a look at the open source Plants for a Future Database. The types of plant data they collect is very extensive (best I’ve seen) and may offer an inspiration for your purposes. Could not find yet if the actual software behind this is open source, though. They have 7000 plants in the database already, I think most from temperate regions … so eventually you and your team probably have a lot to contribute about tropical plants.
Haha I’d love Edgeryders would decide to follow that route 
Since the beginning of the pandemic, there’s a minor boom of novice homesteaders from across Europe setting up camp in Portugal (and sometimes Spain), buying and reactivating off-grid farms there. Many of them document their adventure on YouTube channels (my fav two examples). Pretty sure you can find some success in that space as well.
Always here if you want to bounce some crazy ideas for off-grid living around (esp. energy and food related). Have not done as much experimenting in practice as I would have liked, but maybe I’ll get a moderate amount of that soon (will try buying a little derelict forest nearby in an auction on Wednesday, to make a food forest out of it).