Hm, not that I think about it I believe it's enough to have the rank with the transwarp to Starbase 39. Still weird, as I said I was pretty nice to the Remans and could still spare Janek.
If I got it I didn't notice. I have so many transwarps available to me via my Excelsior that I doubt I'd notice yet another one. I'll have to check later. But I'd be curious as to how I managed to get promoted since I haven't done any diplo missions in a while.