Like most of my best ideas this one is not mine at all.
The brake light pressure switches are notoriously lousy and a real pain to swap out, especially if your rig has the master cylinder heat shield. After replacing two of them on my 3A and then having the one on the M38 go Tango Uniform after only a few months I decided, "Enough!".
Just tonight, I installed a mechanical switch by attaching it to the MC access panel. I precisely eyeballed the fit, drilled two holes, and bolted it on. I was able to leave the faulty pressure switch in place and simply relocated the wires to their new home.
I experimented on the M38 as two more holes in the floor will barely be noticed but if this works I'll likely do the same thing on the 3A when that new pressure switch inevitably croaks. I've seen fancier set-ups with roller actuators bolted to the brake pedal arm but I'm curious to see how long this "down and dirty" arrangement will last.