I look too at the bow of the C-17 and wonder how the bow cracked off. I’m guessing that the clamps, 3/4 x 3/4" wood strips stopped about where that break is. I think I’d be tempted to remove the deck back to behind the handle holes. Then cut out new deck to make a pattern for the bottom to follow. I’d likely cut out new ply with my coping saw in a flame finger pattern on the hull side and the deck. The new hull/deck wood to be stained blood red. I’m not so sure about the wood stem unless it went outside of the current hull. There’s likely a bow pour that would make it difficult inside. Either way the clamps could be improved by extending them to the point farther. (plane ends)
I’m tempted to suggest a Bairdarka style nose that would create a hand grip of deck over the hull sides. But that isn’t practical or perhaps pretty.
There is also an idea to eliminate the hand hold but extending the deck to make a hand hold forward of the “straightened” bow. Kind of a Cyrano de Bergerac nose you could use as a handle. Or not…
Either way I suspect as you sand off the varnish you’ll find that the epoxy is in OK shape. But be sure to remove all the varnish before adding any “maintenance epoxy” . If you just epoxy over varnish is doesn’t work well.
I’d also look at drilling out the screw holes, filling and redrill. I noticed most of them have water soaking signs. Likely just drilled holes with screws no sealant or epoxy fill/drill.