TP
Not a good idea in crowded IFR airspace. PITCH -2 is OK at light weight but risks an overspeed if you are heavy. You should descend out of RVSM airspace but in a careful organised manner having consulted the tables
I suggested Idle, 0 to -1deg since they covered mid speeds for all weight for the A320.
I disagree with you re IFR / RVSM, since we are dealing with a real threat - we are now at 3 total losses from people unable to react sufficiently to UAS. The chance of a midair is tiny by comparison. A bit like an explosive decompression - you don't sit around at 38K' awaiting an ATC clearance to descend
But that is a point of view, not more or less valid than yours...
NoD