Okay. Update time.
Makeover part one has arrived. That's the illuminated shift knob and the wiring kit. I can see why some people would be annoyed with how to wire this if they weren't already going to take apart the interior of the car, since it taps into the radio loom in order to get power and the signal for when it should be illuminated. Beyond that, I just picked up the backup camera I wanted because it was $85 and works perfectly with my head unit, some more shrink tubing, and some bits and bobs to make it so the head unit ends in a female USB port, rather than a Lightning cable sticking out of my center console like it does now. Driving over some brick roads has loosened some of the solder on the loom we made, so the left side of the car sometimes pops in and out depending on bumps in the road. So, in a couple weekends, I'll be meeting up with my friend Cameron again and we'll do the following:
1) Resolder and re-shrink-tube the adaptor loom to deal with sound issues
2) Install the GPS antenna for the head unit, because I've since learned that CarPlay is smart enough to use a car's antenna rather than the phone if it can
3) Install the female USB port in the car for ease of cable changing and firmware updates
4) Install the backup camera to assist with backing up when the top is up
5) Install illuminated shift knob
EDIT: I also grabbed a CravenSpeed MX-5 Stubby antenna. That I'll just install when it arrives since it's a rather easy bit to do. No more tall, whip-y antenna for me!