You don't nuke Germany by making the atomic bomb earlier, but by making Germany last longer. You probably need a PoD back in 1940 or 1941 to delay the Soviet Union by six months or so. Because nobody is putting B-29s - and it would be B-29s - over Germany if it's already full of Soviet tanks.
Did you? I've just had a skim and I can't find any mention of it.
AFAIK, the Lancaster option was only brought up as a stick to beat Boeing with when the B-29 was having technical issues. It was never a particularly serious proposal - and even if it was, they'd have been USAAF owned, crewed and operated, so fantasies of 617 Squadron dropping an atom bomb on Berlin are just that.
... in 1943, at least six months before the B-29 was in operational service. Which isn't a reflection of how it would perform in 1945, after the main technical problems were resolved, with specially developed tactics to deliver a single nuclear weapon, and against a degraded German air defence system.
AFAIK, the proposed tactics for using the B-29 in Europe were to launch from Northern Ireland (as [USER=393]@alertken[/USER] mentions) at reduced weight, run up to maximum speed/maximum altitude over the UK, and generally fly it like an oversized Mosquito with one hell of a bite. With ECM support and diversionary raids, all established features of bomber operations in Europe, there's no reason it shouldn't work.
