I assume the insurance company will only cover your claim if you replace the entire computer with another one made from the exact same parts? Because there are definitely a few places you could cut corners if you had the freedom to; that 1000W power supply was overkill for example and, again, is the very first thing you should be replacing before writing everything else off as dead. Followed by the motherboard or maybe the CPU. I've heard that the RAM crisis has actually made parts that are not RAM or SSDs cheaper because so few people are bothering to build new rigs now, meaning they're not buying any of the other parts either, meaning sellers are getting desperate. I've particularly gotten ads in my NewEgg junkmail for some dirt-cheap power supplies.
One other thing that would help is having another working computer on hand to use as a testbed for each of the parts. You know, take one part out of yours, pop it in the other one, see if it works, repeat. Maybe you know someone personally who could help out there? (I'm just now realizing that for the first time in a long time, my current desktop is too advanced to do this with any of my others, and now I'm concerned.)