Just put the choke on a Manual wire. If your concerned about being able to turn off the engine you can still do it with throttle trim. And as far as starting you only have the choke on for what 10 seconds? one pop. there are a ton of manual choke examples in this thread. You have a decent 2.4 6 channel radio. The manual choke route is free to try before you start spending more money.

Also before I buy any used radio on 72 you have to think about the cost of a check-up with thr respected Mfg. I know I would never fly a used radio without sending it in first for a look over. IMO save your money for a good 9+ channel radio in 2.4