The time for temp change can be helped. There is a dwell setting or I think marlin calls it residency where you tell marlin how long you need to see that extruder holding a temp before it is ready to print. We can also adjust how lax this temp setting is. Whether you want the extruder to hold 235c for 10sec within 2 degrees of target might take a lot longer to achieve than 2 seconds within 5 degrees of target before resuming the print. And turning on the layer fan can help bring down extruder temps a little quicker. So I would just need a way to command the layer fan on at 100% while waiting for temp to decrease. Or maybe I will setup another fan just for that. I have to get to a starting point first, but I look forward to bumping into obstacles. Otherwise this would all get real boring real quick.