Gus, I was distraught to hear of your mishap - and feeling more than a little guilty, personally, for having encouraged you to rig both those planes in - but then equivalently uplifted to hear of your solution: roll out a whole, 'nother kit!
Personally, I would (and did, off-board) recommend flooding the ill-starred hull with white glue: sufficient to (when shaken vigorously, in an upright position) ensnare the wayward part(s) and then - after letting sit overnight (or longer), until the glue solidified - trapping the part(s) inside, along the keel. A secured and heftier model would result. However, it's clear you were already well along in constructing the entire, second-go in less time than it took even for me to come up with the suggestion.
Speaking of which, we now have time to reflect - indeed there does appear to be an opportunity to look back and potentially learn something(s) valuable, here - and let me suggest, if I may, that first among these lessons might run to the core of that essential wisdom, quoted so immortally in the movie Animal House: "Flounder, you f-ed up - you trusted us!"