Using niac and the internet's help, I've got Hylonome routing nerdvana's network. Haven't tested inbound port forwarding yet, and it doesn't seem to fall back to routing global traffic out thru the speakeasy connection when the comcast connection is down, like I /think/ the configuration should have it doing. But, it works for now. I can connect to the world via comcast, and I can connect to my servers without leaving the lan. All is good.
Now I just have to wait for the dhcp lease to expire so I can make sure the scripts to maintain the nat rules work.
edit: Oh, and Hladolet, the faithful netbsd-running Cobalt Qube 2, has been retired and relocated to the South Nerdvana Museum of Computational Antiquities.