Instead of giving the Aussies P-40s, hand them "the French order" -- 75 or so F4Fs (de-navalized, but still better-suited for overwater ops), plus the Martin 167 "Maryland"s and Douglas DB-7s for short- and -medium-range attack and patrol work (plus the historically-delivered Hudsons for long-range ops), in '40; with the experience gained from those, further stocks can be shipped to Australia directly. (Crews wouldn't be a problem; the Empire Air Training Scheme was up and running in '40.) And since Britain used a very small number of F4Fs itself, by standardizing Australia on the acft. mentioned, one does not have the problem of multiple elements of the Empire squabbling over limited British production capability -- for that matter: Australia could acquire the acft. needed direct from the US.
This also alleviates the other concern: The relative handful of F4Fs, M-167s, and such subtracted from North Africa is balanced by the influx of units which, in reality, were shipped to other fronts. (The maintenance crews would thank me -- they don't have to deal with quite so many different spare parts suppliers.
) And since a large part of the question of Threat Response is "can we risk robbing Peter to pay Paul", if the Aussies can be hooked up with units which Britain doesn't necessarily "need", it makes the decision to send them in the first place that much easier.
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