I also can't see Harris or Portal (Chief of Air Staff) agreeing to it, to be honest, not in 1943. Since neither Arnold nor Tibbetts knew anything about the weapon, the RAF heads would have said nope, we got a campaign to run. 1943 was a crucial year for Bomber Command in terms of equipment and role in the forthcoming war - it finally had the aircraft it needed in the numbers required to successfully launch a conclusive campaign - Lancaster IIIs and Halifax IIIs, after the unsatisfactory performance of the Stirlings and Merlin engined Halifaxes he'd been lumbered with in the previous year. Harris jealously guarded his Lancasters and with the Americans unable to give a satisfactory response to his questions, he wouldn't have let them go.
Nonsense. Roosevelt would have asked for the bombers and Churchill would have agreed.
30 bombers represented far less than .5% of Lancaster production.