If you have time to make a starter, do so with the 1056 and save the US 05 for you next batch. If not, then use the US 05 and plan on making a starter with the 1056 for your next batch. You gain nothing by using both in a single batch.
Is the Dead Ringer supposed to be a Rogue Dead Guy Ale clone? If so, I am curious as to why NB isn’t including Pacman yeast in the kit as it is readily available from Wyeast, No. 1764, as it is the yeast Rogue uses in all their beers. Not that the 1056/US05 would result in a bad beer, it’s just that the 1764 will get you closer to Dead Guy, if that is what you are shooting for.