That should work. You could also add a doubler on the other side of the bulkhead, epoxied to the bulkhead for added strength. It will have to be on the other side as if in the main cabin it would cause the chainplate to be moved aft by its thickness.
those pieces of wood in between the bulkhead and the chainplate in the picture arent supposed to be there the other owner added them and cut a new hole in the deck for the chainplate because he raised it of the bulkhead. I want it back against the bulkhead though the original hole.
what about sleeves in the bulkhead that are a little shorter than the bulkhead thickness, so when they are tightened down they compress the wood until they hit the sleeve? nilock bolts too.