Somnium Guitars [0] also makes guitars with easily hot swappable pickups. They have a mounting system where you can put most pickups into their mounting module and click it into place from the back of the body. It’s still a bit pricey, but starts at a less expensive $2,495 MSRP vs $4,500 from Relish.

Here’s a video from Know Your Gear on their product: https://youtu.be/Vj2uJBeSHt4

[0] https://somniumguitars.com