I have some notions if I may.
As the YA-13 work and designation were primarily a Wright Field project, I could see the USAAC
tech folk re-assigning the designation to a P-36 derivative they developed in house. Curtiss was
a mess in the real world with multiple projects, so I could see Wright Field going around them.
As many know Brewster was an absolute disaster and were taken over by the US government,
so it's not too much of a stretch to having the A-32 project re-assigned to Republic to make it work.
However the Brewster aircraft is such a dog that Republic propose replacing it with a P-47C derivative
under the designation A-32B, this is produced in small numbers with the main production variant
being the P-47D based A-32C-5,10,15 'razorback' model and the A-32C-20~ 'bubble-top'.
In Real-world terms the hardest one to get around would be the A-34 as some 450 aircraft were
covered by that designation.
The Hughes could be pretty easy as, ala the later period Bell 'XF-109', the designation is never 'official'.
The Kaiser project is cancelled and the number re-assigned to Grumman in place of the cancelled XP-65,
which was of course, the never built USAAC version of the Grumman G-51, which became the F7F.