Sounds like a good solution. As far as trying to use only one transmitter, I have settled on the flyski gt5, my plan is just to replace the receiver in anything I buy and bind it as another model in the gt5, it apparently can store up to 20.
I like the idea of using lion vs lipo... being so new to this I maybe should have looked at those before I bought this. https://www.amazon.com/dp/B0C1B2K2M4?psc=1&ref=ppx_yo2ov_dt_b_product_details . These fit and so far last pleanty of time but since the controller sits unsued during the week...
i am also using a 2s lipo in my gt5... it seems to work well. Bought 2 for like $15 on amazon, they are only 800mah which i think is less than the 4 amazon branded rechargables I had been using but my gt5 seems happy with them.