Installing hand shower to roman tub spout
I have a deck-mounted roman tub faucet with 3 holes (for the hot nozzle, the cold nozzle, and the gooseneck spout). I want to install a hand shower, but don't see any hardware online that will allow me to do this. It seems like they expect you to tear out the tub, and change the rough-in to a 4 hole one (with the recessed hand shower slot). I don't want to tear up my tub to get this working. Is there any other way? I am a complete novice who knows nothing about plumbing - I would appreciate any help. Thanks.