I already attempted something like this awhile back:
It’s a work in progress and it also includes some bug fixes and benign bits of flavour for a few cards/techs, but the goal is similar.
As for your changes, I don’t really understand wanting to nerf the basic Ottoman units like Janissaries, Sipahi, and Great Bombards. Ottomans had all that in vanilla and weren’t being called broken back then. What’s changed is cards and techs that make them busted and new units that are massively overtuned. I think that’s what needs to be addressed, not the original stuff that wasn’t historically a problem.