Hmmm....
Regarding the first suggestion you could try to slice the model 2 times - one with and one without support and exchange the upper part where no support is needed any more with the gcode from the slice without support... and add a line for cooldown the PVA extruder (M104?)...
Can you follow...? Don´t know if it well explaines what I have in mind... :-)
I don´t know if this could work but I remember a discussion regarding a plugin for change infill...
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Daid 306
Currently there is no real way to do this in Cura.
But do expect support for multi-extruders to improve a lot this year.
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