Since Sabine gives a bomb-slot I thought maybe she can use the U-Wing as a new ride in a triple bomber list.
Heff Tobber (32)
U-Wing (24), Extra Munitions (2), Sabine Wren (2), "Chopper" (0), Pivot Wing (0), Cluster Mines (4)
Warden Squadron Pilot (33) x 2
K-Wing (23), Extra Munitions (2), Seismic Charges (2), Cluster Mines (4), Advanced SLAM (2)
Heff has synergy with the Cluster Mine and flying behind him is very scary. Since he can use his ability even after stopping thanks to Chopper. The U-Wing trades one hitpoint for one evade die and should provide a slightly better platform for keeping Sabine alive. It can't SLAM, which is a big downside, it remains to be seen if large base speed can counterbalance that enough.
There are two points left here. The straightforward choice would be to add Cassian Andor to one of the K-Wings. The effect works great with a minelayer, but what I don't like is how it creates a clear priority target at 35 points. Maybe thats not bad if it enhances Sabines survivability, though. Cassian could also go on the U-Wing, but that would make the Sabine caddy the most expensive ship and remove the great "stop and drop" move that Chopper enables.
The Seismics could be upgraded to either Proximities, Thermal Dets, or a Conner Net/additional Cluster mine for one of the K-Wings.
The U-Wing could get an FCS. Dice-damage isn't the main focus of this list, but FCS is always great value.
What would you do with these 2 points?