Alternate nuclear bombers of WWII

Inspired by another thread, what other method of delivering a nuclear bomb could exist? The high speed Lancaster, the Malton, developed in Canada, powered by Packard Merlin 2 stage engines, with slimline fuselage, no defensive armament.

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The De Havilland Murre, developed in response to the same requirement, based on the Albatross aerodynamics to save development time.

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Well if the B-29 project somehow fails, an option is the less-than-legendary Consolidated Dominator until something like the B-36 comes along..
 
Had the B-29 failed because the engine difficulties proved insurmountable, the B-32 would have likewise failed, as would other proposals such as the Douglas offering, the B-31......

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And the Lockheed B-30 proposal. That the engine became notably reliable was a post-war phenomenon, although alternate historians seem wont to promote earlier and earlier service entry dates for complex machinery. The R-2800 achieved service earlier and was providing similar output at that stage. Probably, the main reason it was not further promoted for heavy bomber use was that it was so successful in those aircraft in which it was employed. Further use would be a logistics and production problem. Upgrading the B-25 Mitchell bomber to R-2800s was denied for just such reasons, that and the fact of the A-26 Invader was powered by P&W. In retrospect, the R-3350 worked well enough to do the job at the time, but it didn't have to.

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