I'm gonna put another spin on your idea, what if a guy was to run the key on harness hot lead to the solenoid trigger that energizes the key on aux fuse block, then run from the fuse block to your other triggers that you want key on power ?? I guess the only difference would be that you'd have fuse protection ??
You can do this as well, I I just ran all my key on trigger stuff to the main buss bar to make wiring easy routing and easy to remember later on. All my accessories are running off the second battery which is hooked to the fuse block, so everything is fused.
If done this way you can use a master on/off/on to control everything run through the fuse box. The store sells a good one and you just need to wire it like the diagram. That’s how mine is setup
This is also a good idea, and there are a lot of folks that have done this setup, although I did not do mine this way for the simple fact that I’m a dumb azz and will forget to switch it back to key on. So my setup is Key on stuff works. Key off stuff no work.
Just trying to protect me from myself.
Good luck, and remember Pics or it didn’t happen.👍