Thanks for all the input, guys! As it turns out, the Aguilar pups aren't going to work out so I'm really starting from scratch with the electronics. The seller played it off like he didn't install the neck pickup because he "didn't get around to it," citing "personal reasons." As it turns out, the Aguilar J did not fit the Lakland route... super sketchy, and almost certainly a dishonest explanation from the seller. Anyway, I had the original LH-3 preamp and LH-55 pickup set, but had already committed them to another friendly TB'er who was seeking these. I was interested in trying something different anyway, so here we are...
I'm pretty intrigued by the Nordstrand brand, and it looks like they can put together a package to mirror the Lakland functionality. So a MM/J pickup set and preamp w/ 5-knobs, 3-band EQ with Push/Pull Active/Passive on the Volume knob. I think I'd also want the coil-select toggle to keep it consistent with Lakland 55-02/55-94 design.
Also toying with the idea of a Trickfish IPA. I have a Trickfish Bullhead .5K amp and really dig it, but currently bypass its preamp section due to having a Noble pre on the floor.
Both Nordstrand and Trickfish offer 15% discounts through Scott's Bass Lessons, so that's another incentive to go in that direction. Will do a little more research this week as time allows, and I'll definitely report back with the outcome!