steam shower

I am remodeling my master bath and have a few questions.
1)The new shower wall is within 1 foot of a 1/2" copper water supply (H & C thru concrete slab) that was used for the bidet but no longer needed. The old water supply (also 1/2" copper ) is in the opposite wall. Can I run the bidet water supply thru a channel in the slab as the new shower supply? If so can I then use the hot water line from the old shower as the supply for the steam generator ?
2) There were no shut-off valves on the old water supply. I will put one on the line for the steam. Are they necessary for the shower ?

Your steam generator takes hot water? Really?

Hi Frenchie

Installation manual calls for cold or hot water line, however hot water is preferable.

Huh. You learn something new... I've only done 2, both called for cold water line. Or at least that's what the plumber set up.