I don't think players would be too excited about losing their heads, bodies, and hats lol
Unless there was a countdown for the new sprite release that required the players to 1. Make hat claims, 2. Make item claims (unless ganis were adjusted) and 3. Fully refund any custom heads and bodies
The hat claims would be the hardest, since hats are worth a lot of money in many cases, but I guess someone could spend their precious time scrolling through all the files figuring out the values of each hat based on rarity.
I personally think it would be awesome to have the OG sprites. I think it would be good for zone, a way to start fresh. But holy **** would that be one massive project.