Eric et al;
Recently I figured out a similar method of connecting an endpoint from a low grade router using NAT on the amprnet without the need for any other routing overhead except ipencap. See n1uro.ampr.org/linuxconf/ amprnat.txt and ampr-with-nat.html if you want to read more about it. It's already being used in the Boston area with success. A static host such as you mention is needed and we're using one.
As for traffic on ucsd, if that's a major problem I would think BK would mention something, but for ampr to ampr points that should be pretty much point to point bypassing ucsd. Pardon my brevity, as I'm on a smartphone. Sent through via axMail-fax by N1URO.
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