Oatey makes a soldering flame protector that you can hang behind pipes while you sweat them.
https://www.lowes.com/pd/Oatey-Soldering-Flame-Protector/1043403
Also there are escutcheons that install behind single shower valves that would make the job a snap.
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"There is nothing to be learned from the second kick of a mule" - Mark Twain
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