Game Mechanics Item Fusing

Have you ever wished you could combine two items?

I sure have.

But how would that even work?
First of all, there would be a unique NPC called the Item Fuser, who would be found in remote corners of a few cities (I'm thinking Lutho, Corkus City, Ahmsord and maybe Detlas).
To use the Item Fuser you would first put the two items you want to combine into the menu. For example, these two Violet-Shifts:


Similar to the Item Identifier menu when using a Corkian Insulator, there would be a section where you can select which ID from the second item you want to select. In this case, mana regen.
When fusing, the mana regen roll from the second Violet-shift (100%) is placed onto the 1st Violet-shift, creating a new item.
This item would have the "Fused" tag where the reroll counter would be. Once an item has the "Fused" tag, it cannot be rerolled or fused again with another item, and becomes untradable.

Balancing
Now I'm aware that this is pretty damn overpowered, as it allows you to create insanely good items. So here are a couple of ideas for balancing:
-Firstly, this WOULD NOT work with Mythic items, as I think that would be pushing the limits of this being a reasonable feature.
-Secondly, as mentioned above, fused items would become untradable, as to save the Trade Market from being flooded with hundreds of max roll items. Items can also only be fused ONCE.
-Fused items with all 100% rolls would not have the perfect tag, meaning perfect items retain their flex power.
-Finally, the cost of actually fusing items would be pretty high. I don't really know exact numbers that would work, but here's some suggestions as a vague idea.
Unique- 16le
Set- 20le
Rare- 32le
Legendary- 40le
Fabled- 64le

Conclusion
Well, that's it for this suggestion, I'm not sure how likely it is that it will be added, but I think it's a cool idea that could be worked on some more. Sorry for the lack of any fancy GUIs, I have no idea how to make them and quite frankly I'm too lazy. Please feel free to give me any suggestions or improvements, and thanks for reading!

 

I feel like mythics should be included into this as well, otherwise I support this.

 

Yeah, I just think it would be a little overpowered. Though I suppose if its untradable it doesnt really matter...