Ok, it sounds relatively straightforward. I wanted so much to take option C. My situation is more complex. I believe that I had my NEM 2.0 clock reset in 2022 when I got additional solar. So, if I wanted to install new PV I would end up with NEM 3.0 for everything.
In your situation you only have 5 years of NEM 2.0 left.
This is how I see it and upside/downside of
Option A): Buy it outright. The primary benefit here is you are buying solar for less than $1/watt. Very roughly, I think it pays back with PG&E rates in less than 2 years. I think it's returning at least $3000 of value/year. Solving the monitoring issue is easy.
Option B): It's a lot like option A, payments are deferred so payment value wise it ends up roughly the same (I didn't do the present value calculation of the payments). The upside is you have a warranty. The downside is you have to make the decision again in 5 years. You will likely have a buyout option again at the end (likely even lower price) or option C.
Option C): I agree with
@rando . This was my original plan. Tesla will likely lose money if they send out a crew to do the removal. It's even likely that you can change your mind and go with A or B if they call the bluff. The main catch is you have to ready if they do call the bluff. Worst case is they actually force the removal of the system. So, if you were going to want PV again then you will be in NEM 3.0 (well, you may be able to qualify a repair/replacement that is close enough size). The cost per watt installed will be higher. Basically, the upside is $4500, the downside is spending more money sooner for a new PV system and possibly ending in NEM 3.0 sooner.
I minorly regret not trying option C. In my case the upside was $2500.