The Hurr1 and Spit1 we have in-game were well after the BOF. BOF era hurricanes had fixed pitch 2-blade wooden props and lesser performance overall. Also the same goes for the 110C and the 109E4 we have in-game. They are not representative for the time frame. The Ju-87 is a much much later model.
If you add all these planes, the only thing in the game that matches this timeline is the a6m2, the d3a, and the I-16 (only if you fly it without 20mm cannons). Maybe the P-40B (maybe not)
What would they fight?
It's like the theater - it demands a willing suspension of disbelief. Which is, coincidentally, what I'd need to believe your unsourced assertion about fixed pitch props on early Spit variants since the Spitters got two-position DH props from the 78th production airframe (a Mk. I, fyi) onward):
The early Mk Is were powered by the 1,030 hp (768 kW) Merlin Mk II engine driving an Aero-Products "Watts" 10 ft 8 in (3.3 m) diameter two-blade wooden fixed-pitch propeller, weighing 83 lb (38 kg).[a]
Early on in the Spitfire's life it was found that at altitudes above about 15,000 ft (4,572 m), any condensation could freeze in the guns. The system of gun heating, described above, was introduced on the 61st production Mk I.[21] At the outset of World War II, the flash-hiders on the gun muzzles were removed and the practice of sealing the gun ports with fabric patches was instituted. The patches kept the gun barrels free of dirt and debris and allowed the hot air to heat the guns more efficiently. When the guns were fired the patches were shot through, these were replaced by the ground-crew during rearming. Early production aircraft were fitted with a ring and bead gunsight, although provision had been made for a reflector sight to be fitted once one had been selected. In July 1938, the Barr and Stroud GM 2 was selected as the standard RAF reflector gunsight and was fitted to the Spitfire from late 1938.[22] These first production Mk Is were able to reach a maximum speed of 362 mph (583 km/h) at 18,500 ft (5,600 m), with a maximum rate of climb of 2,490 ft/min at 10,000 ft (3,000 m). The service ceiling (where the climb rate drops to 100 ft/min) was 31,900 ft (9,700 m).[23]
From the 78th production airframe, the Aero Products propeller was replaced by a 350 lb (183 kg) de Havilland 9 ft 8 in (2.97 m) diameter, three-bladed, two-position, metal propeller, which greatly improved take-off performance, maximum speed and the service ceiling. It also started the incremental weight increases which continued through the life of the airframe. From the 175th production aircraft, the Merlin Mk III, which had a "universal" propeller shaft able to take a de Havilland or Rotol propeller was fitted. Following complaints from pilots a new form of "blown" canopy was manufactured and started replacing the original "flat" version in early 1939. This canopy improved headroom and enabled better vision laterally, and to the rear. Late in 1940, a Martin-Baker designed quick release mechanism, allowing the pilot to quickly jettison the cockpit canopy, began to be retroactively fitted to all Spitfires. The system employed unlocking pins, actuated by cables operated by the pilot pulling a small, red rubber ball mounted on the canopy arch. When freed, the canopy was taken away by the slipstream.[24]
Keep it sharp, Mr. Krusty. Let's not go making factual misstatements.
