It'd be significantly simpler and more compact than the enh/IO menu on the test server, so no issues with implementing it.
Because that was never part of my suggestion, nor does it provide for the much quicker & streamlined process I suggested. If, for instance, I had 3 level 28 acc enh's and wanted a level 28 def, it'd be a simple and direct conversion, as opposed to having to buy a level 25 and 3 or more others, (allowing for some chance at failure after the first combination), not to mention needing to enter the enhancement slotting window before attaining the final level you wanted, then having to exit and purchase more, if a failure does occur.