You could probably install a Dzus fastener in place of the bolt and threaded hole. Dzus fasteners are 1/4 turn fasteners which use a cam-slotted stud turned on to a shaped spring to fasten it (same basic setup as the quick-disconnects for the saddle bags). They are a standard fastener for aircraft cowlings and other panels. You should be able to locate some at an aircraft supply outlet (
www.aircraftspruce.com is one source), or you may want to visit an FBO (fixed base operator) on a general aviation airport (not your airline hub) and talk to somebody in the service and/or parts department, they can probably hook you up with the right pieces, and may even install them for you (some parts of the installation require specialized tools).