I don’t get much traffic and I’m not interested in paying for separate servers for each domain. But I still want https certificates to work properly.
Now I’m familiar with setting up wildcard subdomains with traefik and letsencrypt. But can I do the same or similar with completely different domains such as listed above?
Yes, traefik can do that as well - just point your domains to the VPS and set up yout traefik rules. Traefik will properly create certificates and route accordingly.