So. You cant upradge your swords. Make you to can upradge them. Like to upradge dia sowrd you must need 5 c4s to upradge it for iron sword 3 c4s stone 2 c4s and gold 1 c4
Too OP, just imagine having a sharp3 fire 2 golden sword and being able to upgrade that to a diamond one with just 11 c4 (S3F2 dia is obv the most rare item ingame)
Edit: But I have to say it's a pretty neat suggestion beside the OPness of it