You have a tough situation here because of the other pipes.
Valves sold at home stores tend to have threaded connections, because it is supposedly DIY friendly. All brands are availavle from a good plumbing supply, or special order at the home store, with (a) sweat connections and (b) integral screwdriver stops. These stops are located so the are accessible when the round escutcheon flange is removed. No need open the wall to get to the stops. If you are in a single family home, stops are nice to have , but not essential. If it is a multifamily building, stops are important.
Delta ( a brand much favored by plumbers ) will come with male threads, but the fittings are machined internally to accept a 1/2" copper sweat.
I don't see where that existing valve was secured by anything except the pipes. It really should be supported more securely.
Flame protectors are readily available so you will not have to further "toast" the plastic pipes while sweating the copper.