How about email like:

	Hi, I work with the group that mandates network security
	policy at -----. Recently, we have received a number of
	requests to allow traffic supporting the SETI@home application
	through the firewall. I would like the opportunity to evaluate
	the application, to help our group make a decision about
	allowing this traffic. I noted on the web site that the
	platform I need to use for the evaluation (NetBSD/-----) is
	not supported by the current SETI@home software. I'd
	appreciate it if you could help me find a way to support this
	architecture. If I can be of any assistance (compiling
	binaries, for instance), please let me know. The SETI@home
	project sounds exciting and I look forward to allowing our
	user community to contribute to it.

I don't want to be overtly threatening, but just to plant the idea
that there may be some intangible benefits from supporting NetBSD.