Technically yes, because rabbits are exhibited by phenotype (how they look) not genotype(what "blood" they carry) if these babies were to be bred to a pure SF now you have in 2 Gen a 75% SF cross which depending on the type of the original crossbreed may look exactly like a pure SF if you then take the SF from the 2nd Gen and breed it back to a pure SF for a 3rd generation, you now have a 87.5% SF that will look just like a SF. And that's all assuming that this Original doe was not a SF cross herself. By that point you may have ears that you need to fix, fur texture, pinched rears, depth, and shoulder issues, but even pure (for many generation) SF breeders encounter issues like that.
If/when you get these babies you should get an incomplete pedigree. Showing the bucks complete pedigree, and for the does side you should get a name, tattoo, color, and breed or crossbreed.
If you choose to show, you might want to start with your SF crosses to develop your own SF line. And obtain a pure SF that you can get immediately on the show table. If however your looking at this from a meat perspective I doubt anyone will care about pedigrees "yes honey that rabbit your eating is out of the national convention best of breed winner, so it better taste good!!" lol
And if for fur once you have the SF type then just breed for that.
Personally I breed for show,pet,meat,and fur. I figure why not I'm feeding them for 1 thing why not include others. I do keep pedigrees for all of my rabbits, though I may not pass them on to anyone who isn't showing them.
If you decide to breed your own line and sell for show, I would note on the pedigrees that X generations back there was a mixed breed
