I watched theME run a GMLS squad with Jacen and a few Human Force Adepts against TINT and a standard 200 point NR squad (Wedge, Kyle, Mara, Jaina, Han Smug). Tint ended up winning the game, but it was fairly close. theME only got to use Jacen's Unleash one time, and honestly, I think he had too many of the HFAs. I think he had 3 in the squad to start with, so that was 30 HP off of Jacen right there because of Empathic. I do think the HFA is a good choice though, so maybe just one of them in the squad.
Could go with something like this:
GMLS
Jacen Solo
Leia BH
HFA
Dodonna
Ugo x5
So, 10 activations isn't too bad. Could be tricky keeping Jacen alive, but if you lead with Luke, then have Leia nearby, let her get hurt maybe once, then pull back a bit. Then you could move up using Jacen's Protective +20 bonus (an ability I wish we could see more of, personally). Leia's Shockstaff helps Luke out with keeping key pieces from getting too far away (like Boba Merc/BH).
I still don't think Jacen is necessarily the right choice to pair with Luke, though it is a fairly obvious one. I do like Leia BH with Luke though. And if you didn't burn any FPs otherwise in the round, and you wanted Dodonna to be able to take a pot-shot at something, you could still do Force Sense.
I think for the most part though, it's not worth thinking too hard about what to pair with GMLS. We have to be getting further NR faction support in Jedi Academy, and I would bet there will be something that is designed to work well with Luke, at least besides Kyp anyways.