mad jock you're being a bit obstructional. This was all started by your post #14 when you refused to climb.
A more reasonable pilot would oblige ATC and accept an extra 1,000 ft. Temperature drop (in cloud) would be 1.5 degrees less. Icing was never part of the example.
In any event once the intruder's position is known (e.g. at the hold), ATC can safety pass a vector (e.g. fly to the east) to keep lateral separation from the commercial inbound.
From a higher altitude the commercial can expedite descent i.e. use speed brakes, on the outbound heading to be level per procedure at the turn.
If this became a sticky situation ATC would give the intruder priority.
I never suggested flying below MSA.
flyme.