CafeTran

You can solve this at least in 2 ways via Keyboard Maestro:

1. Pop up a window after pressing a keyboard shortcut and choose any of many keyboard shortcuts:

2. Use the feature that keyboard shortcut can be pressed multiple times, with different functions:

BTW: Pop up a window after pressing a keyboard shortcut and choose any of many keyboard shortcuts:

These windows (panes) can be app-sensitive.

For inspiration, have a look here: https://forum.keyboardmaestro.com/t/pallets-sub-pallets-make-km-so-easy/6070