I say no problem since your only checking for leaks but I would purge the air out befor you turn it upside down. If you put 3-4 psi on the keg to purge te air out first then spray with a little starsan you will see bubbles if it leaking. Then release the pressure then add your priming fermentable.
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Primary's Air
Carboy's Raspberry wine, pale ale
Kegged Cooper's Stout, Coopers lager, Newfie dive bomber pee
On tap Cooper's lager, Cooper's Stout
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