I can't even bring myself to put a memento on these weapons because of how impossibly HIDEOUS they are. They are essentially just dirty versions of the weapons from Curse of Osiris, so why not let us just use those weapon models as ornaments? We've seen something similar with the Season of the Deep weapons being able to use ornaments intended for the original models. I'm sure it'd take a little bit of work, but come on, Bungie. You know damn well these guns are doodoo to look at.