It's just about impossible to consider an ATL if things change too much, but your points 1-3 would make things equally tough for the RAF in the OTL. Remember that in the ATL I postulate, that Hurricane production is increased with 3 additional Hurricanes for every 2 Spitfires produced in the OTL. This gives RAF FC 700 additional fighters by August 1940 and greater production of Hurricanes with the Merlin XII. Luftwaffe losses are very likely going to much higher than in the OTL probably leading to Goring's close escort order even sooner.
I don't think that overall RAF FC losses will be much different during the BofB, but Luftwaffe losses will be much higher because far more fighters will be intercepting each raid and the kill rate per firing pass should remain constant. The RAF only has to scale back it's intruder missions into France in 1941 to dramatically lower their pilot losses and at the same time Malta and N.Africa will have hundreds more HH fighters than in the OTL, probably leading to an Italian collapse in North Africa before the Germans can intervene.
I think the HHII can remain competitive with the 109E but beyond that the HH would probably require a new wing and/or the Griffon engine to stay competitive, however, other aircraft are still being built and even if the Spitfire was not ordered in 1936, it is possible that Supermarine would continue to develop the concept with an improved model (Spitfire III) coming into limited production in 1941. I fully acknowledge that the Hurricane design would run out of growth potential in 1942 without a new wing and/or volume production of Griffon.
You are aware that the FW 187 (with the same engines as the Bf 110 from BoB)could reach 605km/h with 30min combat power (normal cooling no experimental cooling) with the range for London with 30minutes combat time over London?
Also that a 300 liter drop tank had given the Bf 109E 30minutes more combat time over south England?
The germnas fielded 1100 fighters for BoB and at this what if scenario both german fighters would outclass the Hurricane from speed, diving and combat time.
Also you need trained pilots for the more available Hurricanes, to my sources the RAF had problems with enough trained pilots at the beginning of the BoB.
Sorry but I realy think that a Bf 109E7 and a FW 187 would have much less losses in reality (BoB as happened) with Hurricane and Spitfire, with much more losses for the RAF. With only the Hurricane also if there would be perhaps 125-150 fighters more for the RAF the losses for the RAF would be back-breaking.
Every good book that I have read about BoB had analysed for the german side:
1. The stupid close cover order from Goering
2. The shortcomings of the Bf 109E4 through it's limited range and combat time
3. The shortcommings of the Bf 110
All this shortcommings would be eliminated in this what if, with a very clear performance advantage for the german fighters against the Hurricane.
Where is the logic that the LW would have higher losses, even if the RAF could have fielded ~ 150 more fighters, if this fighter is realy outclassed and the german fighters had the combat time to play their advantages?