Hey Reid,
I have an Orion with the Q switch. I had it installed when the bass was being built though. If I'm not mistaken, Essence electronics are volume, pan, filter!?!
Adding a Q switch will give you the option of turning off the filter and having it work more like a tone control. I like having that option personally. I use the filter quite a bit but sometimes I like to just roll off a bit of the highs without affecting the Q.
As far as doing it yourself... There are a lot of projects that I've taken on myself but, putting a drill to my Alembics.... I guess it's sorta like doing surgery on yourself, I personally don't have the stomach for it. HAH!!!
Good Luck!!!
Peace,
Dino