I would start with a basic computer radio with at least 4 channels and mixing. Worst case scenario then is three ESC's, all tied to the throttle. I believe that is doable through mixing. Something like the Spektrum DX5C should work. This way, you have options.

From there, you get to choose your own adventure.

Something like this for an ESC:
https://www.amainhobbies.com/hobbywing-quicrun-waterproof-1080-brushed-crawling-esc-23s-hwa30112750/p564169

​​ebay is a great source for cheap motors like this
​this.