I know I've seen patches to simh on the net to get the bridge
functionality inside simh.
I did some more searching and found this one
http://gunkies.org/wiki/Networking_with_SIMH#HECnet
it appears that this (very short!) patch allows simh to talk directly to the
bridge in Uppsala without needing a bridge on this end at all. It seems too
good to be true, but I guess I'll give it a try.
Bob