Is there a version without physical cable+switch?
One that uses a multiple keys combination (on the Amiga keyboard) to switch between drives...
EDIT:
this one here uses a long reset (>= 4 seconds) to activate the DF1 booting:
https://www.ebay.it/itm/254963982994...YAAOSwOE1f~a31
Not sure if it's comfortable, though. It would seem it loses the setting after another reset.