You can overwinter in one deep, it does take a little more work. But it is somewhat late for splits this year, although it could be done with a purchased queen and lots of sugar.
As far as hiving a package on foundationless....you'll have feed on the hive, plus the queen is in a cage. I'd probably assure that the queen stayed in the cage a little longer, just to make sure that they don't abscond without comb to anchor them. But they are ready to build a hive and will start drawing comb quite quickly.
I use plastic, wax, foundationless, even some duragilt (older stuff) whatever is cheap and available. My nicest combs are on plastic foundation, though.