OP intended discussion of types funded by VJ Day. He's so right that there were as remarkable a range as in the Luftwaffe Secret Projects books. So, in US, B-36 was underway, B-32 Dominator was in a get-well phase, both to be targeted by Republic XF-12 Rainbow, and supported by transport gargantuans Mars, Constitution, C-99.
UK programmes, additional to those noted already, included Spiteful/Seafang, Wyvern, Sturgeon, Spearfish, Firebrand, Shetland, SR/A.1, Windsor.
My A to OP Q: Bearcat +(Sea) Hornet; Lincoln + (in European/Mediterranean Theatres: ) B-29. That lot, even without Fat Man, would have concentrated German minds.