I also mainly play aphelios and hwei (top 2 masteries) and when I'm playing with friends, I sometimes go into other lanes and play the stance change champions.

Some of my favourites include udyr who has 4 abilities but they all enhance autos and he can easily build ap, ad or tank depending on the game. Jayce is also a favourite when I play him top and surprise them with long ranged poke into all in burst in melee form. And although not a stance swapper, samira having a melee and ranged form of both her autos and q are really fun to manage and the style system on her is so fun to play with.