Work on PTR's?

[Lax]

.... I gave you a step by step guide.
1. Select your Character Set in the top pane, then
2. in the bottom left pane click on each Slot number (1,2, whatever).
3. In the bottom right pane, there's a Hotkey box at the top. Set it to something for each Slot

Shift+Alt+M toggles Key Maps. These are Hotkeys configured directly in your Character Set, not Key Maps.

Yep, imagine if you were 10 boxing and you had to set TEN hotkeys! OMG!

And again, by design the software automatically disables these hotkeys. That is where the intuition comes in. In your case, it is failing to detect your Alt Gr key. I'm sorry there's a bug, I understand your frustration. It is easily solved.