On my 88 I've found there is just enough room to pull the headlight knob out to full extension, pop the trim piece loose, swivel it aside, and then push the knob back in to turn the headlights off. This exposes the screws so you can take the bezel off.
There is a release button on the side of the switch body, and it's just barely possible to reach up there and push it if you have long fingers. If you have an extra elbow in the middle of your forearm it would even be easy. I've never popped the knob clip off with a small screwdriver; I'm concerned that such practice will reduce retention force over time as the interface wears, and I don't want the knob popping off in my hand some dark night.