Salt, since you seem to have some time to experiment given your longer season, why not root a bunch of small cuttings off your Big Beef plants, start some seeds from the OP varieties you mentioned, and try your hand at grafting?
This would be a cheaper way to learn grafting as you wouldn't have to spend the money on rootstock seed or more Big Beef seed. You would need clips, but if you don't want to invest in large amounts right now, Tomato Growers Supply sells a few sizes in 20-packs for less than $4. And there are very good and patient coaches in the 2017 grafting thread who will help you at every step along the way.
You could still do your crossing experiments, but those would need many subsequent grow outs before you'd know if they worked. Grafting could give you some good tomatoes to enjoy while you wait!
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