Very very good suggestions, I like all of them!
Dungeons atm doesn't feel rewarding enough compared to PvP since the boxes are out and these things -every single one of them- would change that.
There is 1 thing I would like to add: These Mounts or items in general from these specific dungeon shop(s) shouldn't be tradeable, so that equality between PvE and PvP gets created. Like "If you want these items, do dungeons" as the same for PvP Shop items.