With caddy you can easily set up a local issued certificate for https. It would shine a nice warming on your browser unless you install the CA certificate on the computer you use to visit the site though.
https://caddyserver.com/docs/automatic-https#local-https
This is the easiest way I know how to do it. Caddy takes almost no configuration to get working.
Do you know which modded games are affected? I was thinking of nuking windows now that gaming on linux seemed like it was viable.