How do you think Himmler could have become German's army's supreme commander (Hitler still as Fuehrer and Chancellor).
Isn't it so that Waffen-SS was under Himmler's command only at peacetime.
I think that more natural way to Himmler's supreme command would be to keep Waffen-SS command also at wartime. Then, thanks to Waffen-SS's good success compared to Wehrmacht, Hitler would have appointed Himmler to supreme commander of the whole army.
Do you think Himmler would be bad supreme commander, specifically compared to Hitler. Naturally, best supreme commander would be some experienced Wehrmacht's general.