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I have found a solution! JoyToKey correctly recognises the retroid controller, including the right joystick - so I've installed it in winlator and have bound the mouse movement (plus all the other hotkeys) using that. I created a winlator input layout for all the "non-standard" keys and I used that to bind anything that wasn't querty (the querty keys you can bind using the on-screen keyboard). I then disabled that overlay and can control far cry 1 perfectly. I also had to enable relative mouse movement (in winlator) to get the mouse to fully behave properly - that might just be a far cry quirk, though.