My rig is not as nice as yours
I'm usually playing smaller clubs, breweries, small outdoor festivals, usually with good PA support, and with acoustic guitars (and real piano when one is available). A lot of gigs I can play with a 30W tube amp on stage as a personal monitor, and DI from that to the PA. If I need more stage volume or to fill the room without PA support, I have an Ampeg SVT-3Pro. Either amp goes through a Euphonic Audio VL-210, which is pretty transparent and full range. I love it when I'm playing through it and hate it when I have to lift it in or out of my car (it's about 75 lbs.). I have a tube preamp pedal (which the maker says is inspired by the F-2B) and a simple HPF/LPF filter pedal. Most of my EQ happens there, I could probably send just that to the PA rather than use the amp DI.
I have standard Europa/Rogue controls on my bass. They're incredibly versatile, it's like having many basses all in one. I change settings to get the sound that fits a particular song, sometimes evoking more familiar basses (I can get pretty close to my Rickenbacker, or what a Precision or Jazz aspires to be), sometimes more obviously Alembic.
That picture is the Europa you were referencing? That looks like Signature electronics, with a filter for each pickup, not the standard Europa with a single filter, so you have more flexibility. But as you say, the brightness of an all maple Alembic is hard to lose - I'll experiment more with your suggestion of filter (almost) closed and Q off, and blend just a little bit of bridge pickup along with the neck pickup; and maybe turn up the bass EQ on the preamp more.
Thanks for taking the time to provide the advice!