I'm DMing a campaign and one of the players has come up with an idea for new spell that he wants his sorcerer character to create. The spell is a 4th-level version of limited wish which would allow the character to duplicate the effects of a 1st-3rd Sorcerer/Wizard spell or a 1st-2nd non-Sorcerer/Wizard spell. He's suggested calling the spell Greater Prestidigitation on the contention that the cantrip Prestidigitation is in effect a 0-level version of Wish.
I'm in two minds about whether to accept or reject the spell. Any advice would be greatly appreciated.