melding materia to high level item

[Dustoid]

i need to meld a materia to a level 50 bow for the relic quest; im a level 20 carpenter and dont see myself hitting 50 anytime soon.
i assume there is a way to let another player do it for me right? do i just trade them the bow and materia and they trade it back when its attached? is this common/safe? or is there a better way to do it

thanks