Hmm. That's a tough one. I never believed that Sea Lion could be successful, at least not without a long, drawn out conflict.

First, I'd imagine that there would be a sizable detachment of Fallschamjager commandos to possibly disable any remaining radar after a small force of Stukas gave it a shot. It would take AT LEAST TWO armored divisions to spearhead the invasion, but somehow I could see Rommel initially giving the plan a thumbs-down and not ready to commit his 7th division without further assessment.
Also, the Germans just could NOT rely on aircover - or at least consistently. Remember that the Luftwaffe did not enjoy a realistic amount of loiter time over England as there simply was not enough fuel to do so. This would be a problem.