Maybe a bit blunt, but then running Discourse isn’t for them. If they can’t put in the effort to run it themselves, then they should use the hosted options.
Running Discourse behind an Apache server (which also hosts PHP applications with MySQL) isn’t impossible, or incredibly difficult. You “only” need to be able to run docker contains. You can either use http or unix socket to proxy the Apache traffic to Discourse’s nginx. All this is easily possible on a $10/month VPS depending on the traffic.