I'm pretty sure it is possible, I just don't know how. Found nothing in the console commands or on google. Can somebody point me in the right direction?
Only way I can think off is using console commands to control (i.e. occupy) all the HRE Electors + Emperors and then dismantling via the HRE screen.
That would mean typing in Control X, with X being the region ID for that elector's (or Emperor's) capital, then afterwards, to reset (and prevent wonkiness from occupying territory in peacetime) you type Control X Y, X being the ID number for the elector's capital, and Y being the three-letter code for the country you want to return the province to. You can figure this out pretty easily by starting debug mode and looking at the new info from the mouseover, but otherwise, the numbers and letters for the nations in question in 1444 are:
50 for Brandenburg (BRA)
266 for Bohemia (BOH)
134 for Austria (HAB)
80 for Trier (TRI)
61 for Saxony (SAX)
78 for Mainz (MAI)
85 for Cologne (KOL)
77 for The Palatinate (PAL)
So for example, first time around you would type "control 134" to occupy Austria's capital of Wein, and then after dismantling, type "control 134 hab" to give it back.