So in short you're asking that the British, in the middle of war, completely rearm their invasion force with a weapon that is advertised as a support crew weapon, with ammo that they themselves are not producing, with rifles that cost twice the amount of their main service rifles and buckets more than the SMG they themselves are producing and planning on improving and they'll have to pay for it themselves out of pocket.
Good luck getting the procurement office to greenlight that. At this point the carbine is an untested curiosity that the Americans are procuring primarily for their support troops as a lighter and cheaper (but still expensive) alternative to the VERY expensive M1 Garand. When the US started issuing them in mid-42 to rifle companies the recipients were weapons platoon troops and hq units, the rifle platoons got 1 each (3 in total) out of a total of 28 delivered to the platoon.
So why should the British go: Yeah, "thats our new main line service rifle right there" when initially the purpose of the thing isn't frontline service in rifle companies? And No the SAS pinching SOE kit for special purpose missions is not gonna convince anyone to to replace the role of the SMG among their their riflemen with a weapon the US themselves are not envisioning replacing the SMG but instead are making an entirely new SMG that is suspiciously similar in form and simplicity to the ones used by Britain, Germany and the Soviets.
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