Lots of the variants suggested seem to have performance or functionality that overlaps planes that already exist within the game.
I'm hoping for variants that bring something different that what we already have.
Every option you can think of overlaps...
They all fly, fire bullets, and drop bombs, right?
In that respect there is nothing different you can request.
It's the different performance and capabilities that allow the sub-variants listed above fill key holes in the current planeset.
For example: The B-25J would allow a level bomber that could actually defend itself (tail guns, waist guns, formations, and still retain the glass nose). Can the B-26 already do this? Yes. Can the B-17 already do this? Yes. But for B-25 fans, we cannot. The B-25C is a bullet sponge but outside of that it has poor defensive guns.
For example: The Bf109E-7 would fill a major gap in 1941 and 1942 where the Bf109E soldiered on against ever-improving RAF fighters but before the Bf109F arrived on the scene. It would also serve as a major JABO player on the Eastern Front once the LW invades Russia. As it is now we jump from a 1940 Bf109E-4 to a late 1941 Bf109F4 with nothing in between. That's a long time.