Adding an inner stay for a staysail on the bowsprit

[benz]

If you're landing the inner stay only a foot or so from the stem, I can't imagine you'd need a second bobstay--that stay'sl won't be too shocking big. If going halfway along, I'd say consult an engineer, as there will be side loads as well as up-and-down. The schooner I've sailed a good a deal had a stay'sl on a club. Self tacked beautifully, and on windy days we'd drop the jib, double-reef the main, and reef the foresail. To help her 'round when tacking, a crew would back the stay'sl by holding the club hard over.
Ben