So I really love the idea of using the Elgato stream deck to control lights, sirens, etc, but I wanted to try and make my own DIY version using a cheaper usb keypad.  I found a program called  HID Macros which looks like it should work well, but for some reason I cannot get any of the ELS keys to be remapped to my keypad.  Has anyone tried to do this?  Any ideas as to why the ELS keys are not working specifically?  Other mods are sort of hit and miss whether they work or not after using HID Macros.

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ElGato just released recently their mobile version of a stream deck for iPhone and Android. It's a 15 key for $2.99/month if you haven't found a solution yet.

Don't quote me on this but I assume that since ELS uses these as keybinds:
https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.keys?redirectedfrom=MSDN&view=netframework-4.8
It doesn't recognize the macro buttons unless they're just duplicates of normal keyboard buttons.