And the best possible outcome is they contact you and buy it for some much larger amount than you paid for it.
I wouldn’t touch this with a 10 foot pole. Squatting on domains that contain a trademark with the purpose of forcing a company to pay you out for it is illegal. There would need to be intent, but just going to court over something like that would NOT be worth it.
I have a similar setup and I just have the reverse proxy on the VPS. It then proxies back to the home server on whatever port the service is on. And yes you can forward the original client IP if you wish.