> However, is there a version of cvsup for x86 for netbsd avail?

Yes, and you can run the FreeBSD binary under emulation as well.  In
fact that's what I do; the NetBSD a.out binary didn't want to run on
my -current ELF system, but I haven't had time to look at why not.

http://www.polstra.com/projects/freeware/CVSup/faq.html#obtaining

Regards,

Giles