re: Re-Milling S4S Lumber? Perfection, Spearguns, and Other things

As another possible solution to your drilling conundrum, since you are thinking of breadboarding, you could use a core box bit on the router table to accurately route half diameter channels that would line up when glued.
If you go slightly under sized (smaller diameter), it would make for an excellent pilot where using your final diameter bit  can ream to the exact size and be straight.