The next thing I'm going to try is wiring something to the ambient lights on the rear of the front seat bases.
One option is to hack one of these kits that have side emitting fibre optic in a moulding you can tuck into trim driven by an LED - I'm wondering if I can run them along the edge of the rails and tuck the LED end under the seat base behind the rear plastic moulding:
The other is I have a couple of these cheap "motorbike driving lights" I had hoped to make a reading light out of using the load guard roof mounts but there isn't a good way of cabling to them. They're just a loose LED PCB in a case so out in the wet they'd last a few days, but I filled them with some UV clear resin (left over glass crack kit) to pot them. I'm wondering about putting some heat shrink over the bracket to stop scratching and then just tick under the outer edge of the seat base pointing back, or possibly running up the B pillar trim and point them at the headlining:
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As you can tell currently tinkering with things that don't involve popping trim or making hole.