I don't know if this will help. but we have saddlebags on some bikes that have the quick-clip fasteners behind chrome buckles. It looks like they close with buckle straps but you reach around the buckle to release the plastic side squeeze clip which is what really fastens the strap. If you could find a low profile quick-clip you could modify your kilt to retain the appearance of traditional buckles with the convienence of squeeze clips.

Jamie