Not how the Heer operated in the East in 41, OKW, on Hitlers instruction, required idle tank crews to be returned to Germany to be re equipped and retrained with different/new AFVs.
Reasonable indeed, but when asked specificly on that, the OP did not include that reasonable addition, see pages 15 upto post 307, he specifly does not increase taining, he cuts fuel to the GTR, you know the main way fuel gets anywhwere, just as he has not includded any extra fuel production, he has possited the extra formations are supplied as per the historical timeline.
So lets explore your idea, you expand the Pzr forces by 50% and training by 50% capacity, so you must also be expanding fuel consumption by 50% for those assets. Germany put in place refinaries ( roughly 14 refineries) to double fuel production by 41, (1938 fuel 766,400tons rising to 1,494,400 tons per year)
It follows therfore, since German QM manuals required 3 times the expected consumption of an operation to be stocked before the plan was implemted, MTV consumption means the 500k tons stocked by 41 will be proportional greater by 50% of the Pzr fuel increase. Since fuels 65 tons a day consumption for the 20 extra, therefore by 41 required to produce and extra fuel amount of 474,500 tons of fuel, which required twice that of oil. So you want to increase the refineries by another +50% historical numbers, and increase oil imports by another million tons a year by 41 and increase the buna production, all of which will consume manpower, at the same time you wantb to add 20 Pzr/Mot to the Orbat, so ball park you want to have a million more bodies to work with, not move some from here to there.
Problem with that kind of moving numbers around is that in 38-40 the German military inducted 3.5 million into service, which is not the same as being in the replacement army btw, and that ball park included nearly all of the ones you want to double count as being extra, because they already are going to be inducted, and end up in the KG/LW/SS Heer etc, so they are not extra bodies.
Except that the OP when asked on where the extra training and fuel was to come from, did not expand as you have done. Reasonable people generally only reply to the question as asked and expanded on after questioning it.