AAA
Yes Aozoa, big guns to reach high flying targets, and cm radar and proximity fuses. Precision against quantity. Predictible targets like NY and Scapa Flow would be rather well defended in this way... after some time though.
I don't think the radar aiming nor the proximity fuses were ready at first for the big guns necessary to reach high altitude, so that would require quite a delay. That is, I don't think that the historical Allied AAA using thses improvement were capable of reaching neither 35 000 nor 40 000 ft. Of course i would be just an adaptation but there is a time window.
In 1944 anyway the two devices were quite new and I think, I guess that the anti-V1 AAA barrage of this sort in SE England was concentrating then all the available production. And weren't ready at the beginning of the V1 campaign, which started itself post D-day.
But it is true that the target would have to fly straight most of the time, or performing long and gentle turns.
I also agree that Mosquito above Germany loss rates are no indication against this new type of weapon. Although they should remain concerning fighter interception. Also German Flak did have radar control, in many target if not most that the mossie overflew, and included 102 mm big guns : but couldn't be as precise as centimetric waves radar. Hmm to what extent ?, against well signaled lonely plane targets some 10-20 km distant ? Of course there did have those proximity fuses.
However you need big guns, quite a lot of centimetric radars and new proximity fuses for the 'big' shells., and will not get these until, say in quantity by summer-fall 44. As much as the V1 is to my distaste, it should 'serve' also a lot in this high-tech AAA field, not only fighters.
So the question would how many AAA (fields' with big gun+cm radar+proximity fuses) would be available in Scapa Flow, New York and a handful of other 'hot' targets, by, say, July 1944 ?
Assuming other potential objectives would be left without these. There would be a big rush among the Allied to get these ready for sure, but wasn't there one already ?
It also depends on whether 'my' time frame, for the Super A readiness and deployments could be followed... I think they are correct from a mid-1943 schedule point of view, but how would reallity folllow this ? We do have the number of He-177 produced : 349 A5s from december 43 to august 44, + a number of A3s until june 44 (picking Wiki figures, there might be finer considerations.) Which gives the necessary room for some 10 Super A. aircrafts a month being reached by spring 44 then reduced to 5 a month, or increased ? without much disruption or the historical path, including V-weapon program. While I don't think any wild grand scale order would have ever been made, production might have been maintained post august 44. It fit the IIIrd Reich's tough position rather well, and its thirst for some shock to shake it off.
What sustainable loss ? Not big. I think anything above 5 ac per month would see the number of operatonnal aircraft shrinking.
But there again, like the 8th AF and BC in fall 1943, a switch to weaker defended targets for some time would have been a possibility to gather strength.