I've been thinking (dangerous, I realize) about comments on Allied bombers in Battle of Bodenplatte and/or the lack thereof. I think this is very much a fighter-bombers paradise with aircraft that can carry more ordinance than some bombers but lets ignore that or a second and just zoom in on the premise that people want purpose built bombers alongside the already excellent aircraft set that's coming.
Then I started thinking about the development realities of what the team has to put
Regarding the specific variants I argue the ones you called out are probably too early. Those blocks were manufactured in 1943.
Additionally the VVS had many late block ones as well, so in conclusion I guess probably the G-45/J-20 combination would be the best choice regarding G/J blocks.
The "strafer" concept worked out in the Asiatic-Pacific-Theatre, but didn't in Europe. The Western Allied air forces noticed this as did the VVS.
Consequently I strongly argue in favor of a J/K with an a