Quick brush switching in Grease Pencil

So I've been trying out grease pencil and one feature I've been missing from another program I use is quick brush switching with one key.

The idea is that with one hotkey you can switch or toggle between the previously used brush and the current one. So If I last used the draw brush and switch to the hard eraser, with one hotkey I can switch back to the draw brush but with same key switch to hard eraser.

This feature would be dynamic, where It would remember the brush I'm using now and the last used brush so I can switch between them quickly with on key.