Nothing you have said subsequent to my posts has persuaded me that the information I have posted is invalid and neither have you made any worthwhile effort to dispute my evidence thus far.
Well, I can't be absolutely certain that the information that you posted on the German Bomb is inaccurate, but I can be certain that the information you gave on possible delivery platforms are.
First, the only Do-217 variant that could hit 53k feet is the P variant designed for photo recon, with a third slave engine taking up the bomb bay driving compressors for the 2 main engines
and it can only get that high when stripped of guns, unnecessary equipment, etc,
and with nitrous injection which would blow the engines if used for more than 5 minutes. The actual bomber variants can't hit more than half that with a full bomb load. (which is not nearly enough for a nuke)
The He-277 is similar, with only 1 experimental unit without guns, turrets, sights, navigational equipment, a full crew, or full fuel load, and certainly no bombs that could hit 47k
with nitrous injection. This is what happens a lot with Nazi napkinwaffe planes. Since they never saw production or combat service, people take theoretical performance goals or the maximum performance of experimental prototypes optimized for specific tests and take them as actual combat performance. An actual production He-277 with bombs will be flying well under 40k, and thus easily interceptable by every allied high altitude fighter of 1944. This is not even mentioning how the He-277's maximum (projected) bomb load is only half the weight of Little Boy, and its internal bomb bay is too small to accommodate it. Oh, it might be possible to make a bastard version that could carry a nuke with its bomb bay cut away, kind of like the projected nuke carrying Lancasters, but it will be flying low and slow and easy meat for anything around.
Further, this is also not mentioning the fact that the Allies were able to make intercepts between 45k and 51k as early as 1942 (of photo-recon Ju-86s) with stripped Spitfire Vs.
I rather suspect the rest of your claims are of equal validity, and hopefully some expert will arrive to confirm that.