I believe I understand your Close Encounters of the Third Kind music theory terminology

, but I don't think there's a way to do it, unless the Krome sequencer has that feature unbeknownst to me.
I tinkered around on my Triton to see if I could do it. I tried event editing the time signature for measures I wanted to speed up, but that didn't work. Notes were either left justified in the measure or truncated from the measure.
You could insert a tempo change event to increase the tempo of the song during the solo and revert back to the original tempo at the end of the solo. But you may not be able to set the solo tempo 4X higher than the original tempo.
Best I can think of is to record the solo again at slower manual tempo (but don't record that slower tempo change). When played back at normal speed the solo will play back faster, at the song tempo speed.