I agree with L&VW. From the pics you posted this is not terminal damage. Over the years we've repaired whitewater 'glass canoes & kayaks broken in half, lengthened a 'glass guideboat by inserting a 2' section, done tons of fiberglass puncture & tear repairs, etc etc. If it's made of fiberglass...
Obviously re-axled. I'd like the axle to be moved more symmetrically under the trailer (plus add fenders as Beldar notes). I would check axle alignment ( to be sure the trailer tracks straight). I'd also double check axle mountings to the frame, plus (of course) check the bearings for noise and...
Boy, I think I'd just stick with your current expando plug in the DePersia. The Elvstrom needs a fair-sized hole in a pretty flat part of the hull that's also out of the way, but still convenient to reach--bit of a PITA all the way around in the small Sunfish cockpit. If used a lot the gaskets...
Elvstrom-style bailers work pretty well (better, I think, then the plastic Sunfish bailers), but can be a pain to step on with bare feet. If the boat is slid over beach/grass/dock/trailer bunk/whatever they're prone to damage if not securely closed.
"Old Style" plastic bailer - pre 1973
Part# 91025 (complete) - thread cap is 1-5/16" deep
"New Style" plastic bailer - post 1973
Part# 91026 (complete) - thread cap is 1-3/16" deep
Replacement bailer balls
Part# 91031 (for 5 pack) - balls are 5/8" diameter
To expand on what beldar boathead suggests:
Remember that when aluminum is crimped like this the aluminum work-hardens in the area of the crimp, and that area becomes more brittle than the rest of the spar. I would not try to remove the crimp or straighten this spar (= more bending & more...
Tri-grip pop rivets don't need backing washers, & have quite good tensile strength. See typical shear/tensile specs here:
There is lots of choice in head profile, shank diameter, & grip range (length). Many NASCAR...
Fill the old hole with your choice of polyester/epoxy goop, then redrill and fasten with tri-grip pop rivets. These rivets resist pullout well & install with a regular pop rivet tool: