Im after the same thing for 720...
Nick... i saw that board but it mentions it only works with escs that can be calibrated... i pressume it wont work with botbitz tz85's?
As I understand it, when the IMX-1 inverts the signal it also inverts any trims you may have set in the transmitter. If you don't need a trim to match the neutral point in the radio to neutral in the ESCs then the IMX-1 should work OK for you.
I'm a piss-poor programmer, but it doesn't seem too difficult to use a Teensy MCU board https://www.pjrc.com/store/teensy31.html and an accelerometer breakout board from Sparkfun to make a versatile and automatic steering inverter board, which could be programmed with the trims you need and maybe other functions as well. If you do the channel mixing in the radio, then the programming becomes even easier.
For an accelerometer, I'd reccomend the Sparkfun ADXL193. Really tough and fairly cheap.
https://www.sparkfun.com/products/9332
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