questions about battery disconnect wiring

Sorry I'm just tryin gget stuff done away from the computer.

Cole Hersee 24059 Insulated Continuous Solenoid | Waytek
Is super overkill for the design concept above. It probably draws about the same power as a starter solenoid, and if so I would not use it on the run circuit like shown above.

What about crackedback’s point about the CDR sticking?
Rob can prob better answer that.

In the scheme being discussed here, lets say the relay sticks closed. As illustrated below,
85 connects to 86, so if the relay would connect power black wires to the blue ignition circuit.
upload_2022-5-13_12-55-35.png

With the master disconnect open, there is no battery power.
His poiunt I think is that its possible the engine could keep running on the alternator power. That would be the same situation if the relay stuck closed and the key was turned off.
@67Dart273 has used relays on the ignition to solve voltage drop issues on some cars. Maybe he can speak more to that concern. I'm just not familiar with that happening.

I now know you have modified wiring so the above diagrams are not exactly your car's scheme. But to answer your questions its the easiest for me to show.
Draw out your cars wiring and your goals and maybe we can help further with your decision