There is essentially no way to get this transmog appearance (Evoker boots, LFR Vault of the Incarnates) besides being lucky enough to have the hunter boots from Dathea drop in the raid, and having the roll number high enough to get it, THEN converting it in the creation catalyst. There are only 4 weeks left of the expac, and then it will essentially be futile to try and get this appearance since no one will be running the raid anymore. I even did mythic+ runs until I got a boot drop, then converted it, but it instead gave me the Heroic appearance of the boots, not raid finder.
Here’s my question: why put these boots into the game as part of the Evoker tier set if they don’t even drop from the raid they are supposed to be part of? I’m very confused. You should design the game around getting pieces, not having to work around systems to get an appearance.