I'd suggest:Would it be possible to remap it to F3 and F4 through DSDT? I found out this is a usb keyboard. The VoodooPS2 remap wouldn't work. Also how do you get sleep work? Does it has to be close lid or sleep manually?
Great. Yes, I'm using this app to customize the keys. (I also swap L-alt and L-command)I'd suggest:
Also, you won't be able to remap to most of FN keys (they need a specific driver and don't work).
If you know how to develop a USB keyboard driver, it'd be really helpful (I have this done on Linux, but don't know macOS specifics).