A 2 way switch is pretty limiting so I'd go for an upgrade. It's a very simple mod for a luthier to substitute the 3 way, complete with caps and resistors, that Alembic supply.
Wandering off topic a bit.
Direwolf has 2 position q switches and sounds pretty dark even with the Q on. I was going to upgrade it to 3 position for the extra db. Looking at the filter circuit design it's not too difficult to increase the amount of Q and make it constantly variable with a pot. No drilling needed and a totally reversible mod. I did a test rig which verified it works and I can push the Q to 15db which really makes it sparkle. A bit too much actually but it's totally configurable. 12db is plenty.
Question is would it be heresy to put CVQ on a custom signature bass?