Definitely some interesting ideas here.

I will say it'll be tricky focusing on a character like Ben who's never brought up once in the original films except apparently with Kenobi doing a subtle tribute via his alias. Not saying it can't be done, but it sounds a bit difficult.

The limited number of Jedi does seem to put Kenobi's comments about them being the guardians of peace and justice in a curious light. Don't get me wrong the excess amount of the Jedi in Lucas' prequels certainly diminished the concept as a whole, but it does strike me as odd that that there would be so little of them.

I await to see what the infertility of the Jedi means thematically and in terms of character, but at the moment it seems a bit unnecessary. Yoda and Kenobi didn't seem to have children, but that no more implies that Jedi can't have them due to biology than it does because of their beliefs.