I did wonder if they should perhaps consider doing that. Or even making changes to the Highlander to free up a half-set - perhaps run Aberdeen via Inverness, or Inverness via Aberdeen, instead of the present split? (The FW short set is perhaps less useful, though a "day" Mk2 BSO could be hired to be used on that to free up a proper Sleeper one as it has been in the past)
Isn’t the line shut somewhere around Inverurie at the moment for engineering works.
It’s highly unlikely they would attempt it anyway but the closure would completely rule it out.