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I haven't messed w/ DIYFPVs sim, but I'd think you'd be hard-pressed to make that configuration work for you, as joysticks use an analog control setup (a spectrum of input values from 0-100% deflection) whereas keyboard input only deals in boolean values (on/off). Because of this, even if you could bind your keyboard in this way, you'd never get realistic control behavior out of the config, since pressing a key would equate to 100% stick deflection.

That said, you could probably custom-build your own input handler to spoof analog input (such as longer keypress == more stick deflection), but I doubt it'd be fun or at all useful as a potential solution. You'd be better off just grabbing a cheap radio transmitter (like the Radiomaster Pocket) and using that for the sim.

there is no real way to enjoy the sim with keyboard. 

this is why we implemented touch controls. so you can load it on your phone and at least try it.