I'd give some of Connor's time to Perreault (especially when the Jets are in the lead), and a bit of Wheeler's ice time to Ehlers. I think that PLD could also take the occasional shift instead of Scheifele. Basically, I think the Jets can even out ice-time a bit during this season, which has such a compressed schedule. It would also be rational based on performance (Perreault and Ehlers have been very effective).
I like the idea of adjusting minutes - but I don't know how easy it would be to do based on what you are suggesting.
With Scheif, I get it - he tends to take / get extra shifts and it would make sense to give some of that to PLD - especially when we have a lead (as you noted).
I don't know what you have in mind with Matty - are you suggesting he double shift and KC sits under some circumstances?
Or does KC move to the 4th line (simply switching the 2). If so, wouldn't be easier to give the 3/4th lines more ice time (as complete) lines, as apposed to pulling playing out of the top 6 and filling there spot with 4th line players.
Matty been great this year - I'd like to see him get more minutes - but I'm not sure why KC is the guy he subs in for. That line is playing well.
Matty is playing against 4th line matchups - that might have something to do with his good play.
There might be other top six players that would move down before KC - I also understand opinions will differ on that point.
Personally, I can't see it ever happening.