Ooh, I'm a big Blaster Master fan too!
Jason and Sophia being a two-in-one fighter is pretty much a must. It's the game's core mechanic after all. And I could see Jason play as more of a Mega-man/Snake type character and being a fair lightweight.
And I could see Sophia being a bit of a R.O.B x Samus kind of fighter, and of course more of a heavyweight.
I'd love it to pieces!
Also having Jason Frudnick and Sophia in could explain why the Landmasters are gone
Seriously though, it's always one of the first NES games we get on a new generation console... I find it odd it didn't even get a single spirit honestly. I'd gladly take anything at this point.