I've test driven the "Remove fields except" Action and it is very useful. But I wanted to invoke it with a hotkey. This is the best workaround I've found:
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first open the actions group window and change the name of the action group from "The group name" to "&The group name". The & character means that the entry will be keyboard selectable in the menu. (I found that trick here ) . So we can trigger the action with first Alt+A and then Alt+T (where T is the letter after the & in the group name).
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This Autohotkey script bundles those two hotkey steps into one
#IfWinActive, ahk_Exe mp3tag.exe
F4:: send !A T;press F4 to open action menu and do action with underscored letter T
#IfWinActive
To use another hotkey change F4 to any other key or key combination supported by the Autohotkey language.