Pyth said:1. Bombers soften up targets.
2. NAval fleet takes on Royal Navy.
3. Invasion begins, on transport ships... Not Rhine Barges.
4. A rush for cities.
The problems with this are as follows:
1) The bombers get shot to pieces by the RAF
The Path of the Battle of Britain in OTL show us that the RAF was able
to prevent the level of air superiority the Luftwaffe would need to be
able to "Soften up targets" the way you suggest
2) The Royal Navy then turns the Kriegsmarine into so much scrap metal
Because the Luftwaffe and RAF are disputing air superiority they cant
provide the combat air cover needed to keep the Kriegsmarine in
being. In the surface combats in Norway, the RN managed to get a
very beneficial exchange rate in the light craft actions; and the last
thing the Kriegsmaine can cope with is a battle of attrition
3) Invasion begins, on transport ships... Not Rhine Barges.
The Transport ships suffer massive losses because the RN is still in
being. Perhaps a few arrive in the Channel portts, but they get seized
in the ports by the British defence forces.
4) A rush for cities
Well, that is just a non-starter, sorry