Hi t3yf5g!
A lot of people fly multirotors with other radios too. Unfortunately there are no BNF kits compatible with Futaba that I know of. Most BNF models either use Spektrum or Tactic protocols. That said all is not lost! You can check out the AnyLink which you plug in the trainer port on your radio and will allow you to bind to any model that uses the SLT protocol.
The other option would be to look for a PNF or RTF with a PPM input. Then you just add your favorite Futaba or Futaba compatible FrSky receiver. If you get a model with PPM input you will need an Sbus to PPM converter module.