The assumption of HoH vs. LtC will make a big difference in your choice of legacies, I think. Valiant Strike Healing now has a place on a general emblem, but an LtC build will still prefer Rallying Cry Healing. RC has a bigger initial heal than VS does, and benefits more from the percentage legacy.
Most significantly, LtC definitely wants Strength of Will Effects. (I'm not going to assume swap items, because I think in-combat swap items are anti-fun and should be removed from the game.) HoH can make good use of it, but doesn't care quite as much.
My logic is this: After the reduction of the SoW legacy's maximum benefit from +15% to +10%, Shield-Brother for main healing gives a significantly smaller advantage over Song-Brother than it used to. So, an HoH Captain can effectively main heal with either Song-Brother or Shield-Brother. But while a Shield-Brother HoH Captain absolutely requires the SoW legacy, a Song-Brother Captain doesn't get much from it.
So, a Song-Brother HoH Captain has the option to build a healing emblem that excludes the SoW legacy and doesn't swap it, either.
The emblem I'd build for that is like this (since we're assuming 5 majors anyway):
Vocal Skills healing
Melee Skills Healing
Valiant Strike Healing
Words of Courage Pulses or Time of Need Cooldown or, for the heck of it, Shield of the Dunedain Cooldown
(see above re: swapping)
Cainwen Ciaphas, Captain of Crickhollow, HERO OF MIDDLE EARTH!!!
I will not be pushed, filed, stamped, indexed, briefed, debriefed, or numbered! My opinions are my own!