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Just following back up after I found the issue... It was a bad wire between the dual pressure switch and the A/C switch. By walking through the service manual diagnosis steps for a compressor clutch not engaging, I narrowed it down so that I knew there was something fishy between the dual pressure switch and the A/C switch. From there I ended up getting a cheap short detector from amazon and ran it along the wire harness that runs between dual pressure back to the dash A/C switch, and found the spot where the signal drops. Turns out the harness was damaged there. I must've accidentally cut it on some previous work. Here's the short detector... it worked pretty good for the price: https://www.amazon.com/dp/B07BC4X28Y?psc=1&ref=ppx_yo2ov_dt_b_product_details My advice for DIY A/C diagnosis is to follow the service manual steps. They were systematic and worked pretty well for me in diagnosing the electrical problem.

Maybe. Ignition switch failures tend to cause all sorts of weird glitches and it's common in Nissans for it to fail, so I'd change it, it's a simple job and relatively cheap. But I would also look at the relays in the engine bay. Try swapping identical relays and see if some of those issues go away. To give you an example: my AC was randomly spewing warm air. I replaced the HVAC module and it was doing the same thing. I even disconnected the air mixing actuator. In the end the problem was the relay that controls the AC compressor which was intermittently failing and I found it by swapping it with the fog light relay. My fog lights started acting up and the AC started working fine. So check relays too. Start from the cheaper, simpler things then move on to the complex. I'd leave the starter for last. It's not easy to replace, access down there is terrible.