Ya lack my mad skilz. It is only seconds once the drilling starts. The minute is for getting ready. I would not drill the length of the bolt. Only the two millimeters to free the head. Truly trivial.
14 bolts, 14 minutes top. Less damage to the track than the corrosion has done the years. One needs to take some care — which is obviously in short supply among all the brutes here with sledge and power hammer ideas. This is a plastic boat, ya know?
This may be the only time one will appreciate...
The adhesive that bonds the deck flange to the shear flange will be holding the bolt as well. Especially from pushing out. Also, it seems boatbuilders often drill fastener holes for an interference (partially threaded) fit.
Regardless, the best way to proceed is to stop fooling around with all...