We are about to rip apart our main bathroom (that has the only shower in the house) and therefore won't be able to use it during the reno.

Our backup bathroom has a clawfoot tub (no shower) and an angled ceiling, but we *really* want to be able to shower there while the main bathroom is ripped apart.

How would we retrofit some sort of handheld shower onto this clawfoot tub?

This is what the backup bathroom looks like:

and here is a close-up of the spout etc where we'd like to attach the handheld: