Guild Wars 2

It still works, I’ve recently done it to transmute a Vigil armor piece (I picked the wrong faction).

It shouldn’t be a large waste of your time to just make a new character to test it out. It also doesn’t matter which race or class you do it with. The armor itself though does have to be class and race appropriate to be equipped (No cultural armor transmuting, e.g. Transmuting Norn armor to used on a Human).

Make a new character, engineer in your case (make sure to pick the universal toolpack), and head to the nearest with Black-Lion merchants and banks. Find a white back-piece and transmute it with the toolpack to “un-soulbind” it. Put it in the bank and take it out with the desired character you wish to use it on and do whatever you want with it.