I hope everyone is aware that RVSM contingency procedures are only used if you are NOT in 2 way VHF communication. The clue is in the name "contingency procedure"
So for almost everywhere unless oceanic its ATC clearance first and stay on track unless someone is blocking where you need to go in a hurry. Even Oceanic its far easier to get a CPDLC emergency request out.....if fitted.
NAT MNPS is of course a different case