IMO at the END of a keto diet it would be a great way to introduce carbs and assure that the glycogen gets shuttled to LBM instead of spilling over and being stored as adipose.
Quite a cool idea...in theory...to jump start a cycle after a diet.
I would want to introdue the superdrol about 24-48 hrs before the end of the diet (carb up). You may become quite lethargic during that period.
To assure that you shuttle all that carbs to LBM I would consume my first carb meal a few to several hours prior to my workout and then there after as you normally would. Never a big fan of hi GI carbs. I would proceed like a normal keto carb up for the first 48-72 hrs (depending upon your metabolism) but I would be leery of overdoing it any time too long after that, and taper back to a reasonable carbs filled diet.
Keep us posted.