Just to verify, will Pt2 of the trip be conducted solely aboard the shuttle, or will there be an additional space walk involved? I know Tomar-Re's spaceflight is compromised by proximity to the Omega-4 relay, and I'm not sure if any other characters have a similar limitation.

If it's from the shuttle I vote for either relay, though if a spacewalk is involved, I would suggest the Omega relay (for reasons stated above). It would also offer some interesting plot repercussions if Omega citizens found out and thought he outsiders were manipulating the relay for their own ends.