I would like to point out that the "Early war arena" was attempted in AW several times.
It always failed.
Aside from the people in favor of it on the BB's, apparently there was very little real enthusiasm for such an arena. It usually sat around empty.
However, since it didn't do any harm, I can't see a reason not to try it in AH. We already have plenty of earlier planes to choose from:
Spit 5, Seafire, 109F, M.202, A6M5, TBM, JU-88, YAK-9T, F6F, TANK, M16, M3, PT.
Perhaps include the B-17 if a better bomber is really needed, but if so also include 109G6 as an anti-bomber aircraft (30mm and 2 20mm guns nice against buffs).
NOTE: F6F is not early-war, but its performance fits in well enough with those planes to warrant its inclusion as the only American fighter available.
No perk planes for this arena. Make this arena an escape for those who dislike perk planes.
It might work, or it might not. It's worth a try since no harm can come of it.
J_A_B