Sorry. Not trying to be a dick, just saying that it’s really hard, even for someone who’s spent almost ten years installing Discourse for people.
Basically saying, yeah, it might not be completely impossible, but it might as well be.
The install docs say pretty clearly that the only supported way to do it is on a VM with nothing else running. There are some docs about running with a pretty vanilla reverse proxy, but you still need to know a fair about about reverse proxies and Discourse to make those work.