Paul Dye recently wrote an article in Kitplanes magazine about fabricating tie wire tabs that are cut and bent from sheet metal. The tabs go under a bolt or nut that is convenient and have a hole drilled for the tie wire to attach. That may be a solution for you.
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build