I cringe every time I try turning off a cheap plastic stem stop and it "winds up" about a quarter turn before it moves.
The OP needs the water to be capped off even if the stop is turned on in a way that the modification is reversible.
I have a lot of high rise accounts for over 32 years
https://www.riverpointtowers.com/
and the Empire state building where we installed a sprinkler system on the 86th floor
Look how much an apartment goes for and I did a lot of work here a leak IS NOT AN OPTION
https://www.cityrealty.com/nyc/beekman-sutton-place/the-sovereign-425-east-58th-street/5107
Knowing the static pressure and also knowing the liability when working on these high structures why would anyone even consider a plastic stem?
Most of the one family houses we work for are over 5 million dollars each and why take a chance using some cheap imported valve to save a little money?
I think it is odd hearing "I do commercial work " or I do residential work and use different materials
All my drainage piping whether it is commercial, residential, industrial or institutional is domestic cast iron piping for vent and waste and type L tubing for water supply above ground and K tubing for underground .
Even the heating systems we use L tubing for hydronics and schedule 40 black steel for steam and stand pipes
I found it cheaper and easier to stock my vans with materials I can use an any application
Acid and chemical waste systems we order materials as needed
I not only work here I live here so I better make sure there are no call backs as your only as good as your last job
https://www.point2homes.com/US/Luxury-Real-Estate/NY/New-York-City/Bronx/Riverdale.html