I just hate selling so much to the npc when someone could us it as a desynth item.

I think it would be great if i could give u/u items to people that i cannot desynth myself.
Maybe a desynth window similar to the trade window that only allows for player A to select an item, then only allows player B to desynth that item.

Or be able to send a u/u item by moogle mail and have it gain some sort of desynth only tag so desynth is all the recipient can do with that item once it is sent.