would be some alternative to sniping
BH already has a really strong close-quarters game thanks to DLT-20a Burstfire + Gunkick + High Movespeed.
I'm a big fan of KOTOR-style vibroswords, but am not sure how to fit it in. Ostensibly, if a gunner class is ever given a vibrosword, they should be able to block sabers but not blaster fire, and it should be a fairly expensive option that gives them more capacity for resisting saberists, at a reduction to their ability to deal with other gunners, or survive overall. It could be a good thing to have available if flinch gets removed and gunner kills get more officially free.
Personally, I would put vibroswords on ET/Commander, and make it so buying a vibrosword prevents you from buying two lives. It fleshes out the Elite Infantry, Hold-The-Line style of ET and gives ET/Comm more of unique playstyle options beyond "grenadier" and "good gunner." And it means KOTOR Mandalorians with vibroswords, although it also means Imperial Officers with vibroswords, which is strange.
But it also means Thrawn with a vibrosword, which is awesome.
(and rebel elites with vibroswords doesn't seem like a huge stretch. Rebels are a scrappy bunch.)
In a very roundabout way, it could replace Dodge as the "eliteness factor" of ET. Dodge currently gives ET a special frontline-fighter shtick of being extra good at using cover to be immortal in a gunfight. But while I appreciate the idea of dodge, I've never thought any of the dodge implementations were fun to play against. Adding a vibroblade moves the "front line sustain" aspect of ET from gunfighting to repelling saberists, letting the role of Most Cost-Efficient Frontline Gunfighter return to Soldier, where it should be, and giving elites something else fun to do.
(also, vibroblades should be effectively Saber Defense 1.)