My gut response from what you've described on your wishlist is probably the Silo or the Crawler. Crawler will be the less hot option, more old school. It's got a reputation as a dark pickup, but from a conversation I've had with Ben at BKP, that's only relative to some of the vintage/hot designs as it's overwound 43awg; the Nailbomb is then a step up in output and a bit darker than the Crawler before you then switch to 44awg for the more modern pickups.
I've got Silos but not in rotation at the moment. The voicing is definitely more towards the low end and full mids, so it ticks that box. I'd expect the Silo to match with the Triptychs, both being Rabea sigs, and it'll definitely split well.
So I'd say Silo for darker but tighter and more modern, Crawler for more old school hot-PAF vibes and softer feel.