Well, I ran into this issue when trying to change my costume armour, and wanting to shift my Proto Crest. Problem is, you pretty much have only one of each Crest, minus Frosty and Hallow.

I propose that these 'One of a kind' (at least to each player) be shiftable, but soulbound.

Each of us only has one of each of the crests, and there's no present way to get another of any of them. (Besides Hallow and Frosty)

Ofc, this may shift to other accessories, but only ones there's no other way to get. Expensive ones don't count, because you can still get those, albeit at a high price.

Crests however, are soulbound to you anyway. You can't trade them, you can't sell them, and there's no other way to get more of them.

So if you bind it to an armour of yours, then change your preference, you can't get the crest again. That's it. Can't even buy another.

My proposal is to allow you to move your crests on and off your armours (at Bechamel) freely, considering they're stuck with you anyway.

Armour that the crests are on will be stuck with you too, until you remove the crest at least.