Thank you very much for such a comprehensive answer I haven’t even expected.
As it seems the ground is totally unknown .
From personal experience a lower gear is more useful than the highest and that is the clue of this modification. Well the highest gear is still really welcome. 
Modding Strida C1 in the way you have described is similar to building a new prototype, a lot of changes, a lot of “unknowns” and a chance of success uncertain. Putting a chain on Strida looks weird also. Hmm. Lot of work, lot of money , not easy. I think I give up the idea for now.
The weight and design of C1 is still worth consideration as I was given the opportunity to buy one. Hmm…
Thank you once again for answer.
Best regards