Steve, I believe you and I exchanged emails yesterday/today.
In regards to printing your 8x10 negs I imagine you will find that you'll be able to manage using the Palladium+Na2 rather well. Ive been able to get fairly nice looking pt/pd prints from negs with minimal density ranges. Have even used it when printing some old 4x5/8x10 negs dev in everything from Rodinal to Tmax to DDX to D76. May end up using a fairly large (relatively speaking) amount of Na2 but you should be able to work with them as is.
Personally, I wouldnt worry with duping until after you've tried your hand at printing a few of them to see how they look.

The general rule I've experienced is that the rare instances when I have a perfect pt/pd neg, it would print at Grade #0, or so I've heard.... as I've yet to create a perfect pt/pd neg