New shower using existing shower.tub valve

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Honolulu, Hawaii
Aloha all,

This post may be lengthy, I'll try to be as succinct as possible.

I've an existing shower which I plan on remodeling, as is is now the shower valve is a vintage Moen single handle tub/shower unit, plumbed off this valve is a tub spout with diverter and (2) shower heads on opposite walls, each shower head has an isolation valve inline.

Using the existing Moen valve, I'd like to add a transfer valve to either operate just one shower head or both at the same time or independently of each other, I plan on removing the isolation valves from both shower heads.

I plan on installing a non-diverter tub spout and would like to control it using the transfer valve indepently of the shower heads.

To further complicate matters, I am considering installing (1) body wash spray and have it flow with just one of the shower heads.

Water pressure @ the shower is 60 psi, fed by 1/2" copper pipe, so that should not be a problem, retaining the original Moen valve is a must.

Can anyone off insight as to what type and number of ports transfer valve I should be looking for?

Hey, wait a minute.

This is awkward, but...

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