You can already use those appearances on any weapon.
If you’re talking about whether you can equip your legion artifact and transmog over it with a legendary? (Say, for an alt) I don’t know. I would assume so, as long as you can transmog an artifact normally.
As far as I know Artifact weapons do not show up under appearances last I checked. (I could be wrong)I know you can transmog the artifact weapon to something else but I want to transmog my existing weapon into the artifact. Imagine a a shammy walking around with Doom Hammer! (again)
I guess I will have my answer tonight when I get home providing the servers are up.
In the transmog page, go to the little drop down menu that lets you select the different type of weapon (2h Sword, Staff, Polearm Ect…) and in there it will say “Legion Artifact” select that and a new menu comes up.
Unlock Vulpera
Roll a Vulpera monk
Deck it out in full looms
Faction change my 120 rogue to Vulpera
Faction change my 120 monk to Vulpera
Start leveling my fresh monk (for the racial armor)
Dunno when I’ll get around to doing the cloak and invasions etc. Eventually I guess, but not in any rush TBH.