Ok I see it now, You can take a strip of thin steel sheet metal about1 1/2 x 4 , hold it with a pair of vise grips and heat it with a torch and cut the straps against a piece of wood to shorten them, the hot metal will seal the cut edge to keep it from fraying.
You need to put a ty-wrap around the locking arm for the cable clamp to prevent your foot from kicking it open as you climb in and out, there will come a time that the throttle will not work and that will be the cause.. Still dont like that clamp sticking out where it can bang your ankle or get your suit/shoes/boots hung up on. Most builders use a aluminum cable clamp that goes over the part with the ring slot and a 10-32 goes thru the clamp and registers on that slot and then into the frame bracket. simple-clean, out of the way, and only takes 30 sec to remove. person pref is to have a heim/rod end on the peddle instead of a quick disc, a lot stronger and will not brake or pop off. If you still want to use the QD then put a ty-wrap tight around the barrel so that the sleeve cannot slide back on you
Also cant see in the pic, but make sure the throttle peddle has a return spring on it also.