It is coming soon! Here is a Hybrid ZTR prototype my company has been working on.
https://www.youtube.com/watch?v=J34KU9OG9M8
Need three point hitch, loader, PTO, and industrial tires.
When you (or someone else) makes one with equivalence to about 30 or 40hp for under $30k and, I will instantly buy it.
All of those things are certainly doable, although we will be pretty much eliminating the hydraulic system, so the PTO and loader might need to be thought out a little differently.