If anyone finds this, the solution I ended up going with was to just make it a part of a startup bash script and put it in the file system of the ISO so it runs on login for every user. Couldn’t figure out how to put it in the preseed.

I got my account unbanned luckily, yes. I’m giving up on the site as a support avenue for now though. Seems like too much information is being filtered out to be helpful.