Inside the controller, there should be a Tx chip and inside the dragonfly there should be a Rx chip. You could bypass these chips and lead them to a chip like the qkits.com TX433 and RX433. these operate on 433Mhz, which may or may not be illegal to use for hobby purposes, in ohio at least its legal as far as I know. The only considerations are powering the chips, since the 27mhz chips probably use lower voltage, but that'd depend on the chip. Does anyone know what the part numbers are on the chips within the controller and dragonfly?

A replacement should be possible, i got my dragonfly cheap at bestbuy, so maybe I'll go back and get another one to mess with. THe only consideration one must have with this is antenna tuning, the dragonfly should be fine as is, but the controller antenna would more than likely need to be replaced with some thin copper magnet wire of a certian length.

What we need is the name of the company that makes the tx/rx chip, or if it uses a tuning coil and just pulses the signal down that. That could be the case, but to be sure we'd need to verify every IC on the controller and d/f to find out what each one does. 

well its not so much what they can give us, more like what they're willing to pay for. There are actually subsets to the 27mhz and 47mhz frequencies, if they wanted they could only manufacture 27mhz ones and just use a few subsets of it, i'm sure if there's future models they'll probably have this capability, but replacement is still a real option. I'm sure even if the devices only have a tx/rx system for 27, and 47mhz, there should be similar chips with similar pinouts.

If not however it still shouldn't be hard to mount another chip, providing we can power the chip and hook up the input to whereever the devices are generating the signal on the board, and we should be able to broadcast on that frequency instead.

The power requirements for the tx/rx are probably pretty low, i know the 27mhz tx/rx chips i have use a little more than 1.5v in my circuits, but my 433mhz chips have a power range from 5-10v, needing at least 5 to function at all. If the power requirements aren't enough to power the chip we're mounting, then we need to provide it with power as well.

That shouldn't be hard to do, the only thing we'd need to know are if the devices use a chip, or a tuning coil. if it uses a chip we have to make sure to disconnect it from the circuit, since it'll be a drain, whereas the coil isn't really a problem.