Tom, you know and I know that this cannot be done. Every sub-domain is a DNS zone of its own, you could not have rmm.bowlofnoodles.net link to <BoN IP> AND <mc server IP> at once, but if they are the same IP then that would work fine.
However, you could create two zones, rmm.bowlofnoodles.net being <BoN IP> and a website or homepage, then server.rmm.bowlofnoodles.net or something linking to the MC server, as DNS sub-zones can be created easily in Plesk.
As per sub-domains for others, that would work out nicely I think.