I think a class change abillity/ticket will be very nice. And so much of class specific gear isn't in the game.
If they formed the database right, this isn't really complicated for the most items.
In my opinion the most difficult items are the soul shields and the soul badges. By the soul badges especially the fused ones. Because the fusions need other season badges for each class.
And the soul shields because you can obtain soul shields from every class, so the class there is bound to the item.
Instead the Hongmoon weapon or pvp weapon were bound to the characters class.