I started to reply to this and then I noticed Hey, I'm the one that started it several years ago. Here is how this story ended up.

I installed a terminal strip with a inline bladed fuse on every terminal. One side of the terminal strip is a 12V bus. Every instrument hooks up to its own individual terminal. Have a large toggle (locking) switch to connect each battery to the 12V bus. Each device without it's own on off switch, has a small toggle (locking) ON/OFF switch on the panel. The only panel mounted fuse is for the (unswitched) gear horn circuit. just in case another of those dang magnetic switches falls off in flight again. 3 seasons on the new panel, no regrets or issues.

SF