Is my belief/solution here too simple? Why not just edit the (darned) DNS zone file of
muug.ca and give it exactly the same type A records (for IPv4) as found in the zone file of
muug.mb.ca, assuming that you do actually want both
muug.mb.ca and
muug.ca hosted in the same place. Additional type AAAA records (for IPv6) are of course welcome to exist. Oh, you would also need to make sure that the hosting of
muug.mb.ca is set up to recognize an HTTP 1.1 request for
muug.ca - merely pointing
muug.ca to the same hosting isn't quite enough.
You should also make sure that www points to the same place, either via CNAME or via an identical type A record.