Adding this reply for anybody else reading the posts - this issue has been resolved. It seems to be a limitation with MCM in what you can set as a hotkey. I've tested it with regular keyboard letters and they work fine.
Have you turned the hotkey functionality on? (The option should be just above setting the hotkey in MCM). If this is not selected, the hotkey won't do anything (all the other options for hotkey and aid item are hidden until you turn it on, but you can't hide setting a hotkey)
This ones files have the same names as the original mod, you can just replace those files. It should be fine to do this in the middle of a playthrough.
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It doesn't seem to do anything.