I just want to make a suggestion. People may call me lazy after this but I will admit that before I even continue. When it comes to making T6 I am lazy and I get so bored that I could just cry lol.
SO, here is my thoughts: Have the NPC that sells the fusion stones or a new NPC, sell us T stones at whatever level we want. Of course it will still cost us the exact same amount in gold and charges that we pay now. So If I wanted to buy a T12 stone then that NPC would sell it to me but charge me what it would cost if I were to make it myself.
Now, on the game, people are making T14 stones and you know they would probably make higher if they did not have to spend days making them.
Just mu thoughts
Pyper