thanks for the offer, i am a UK size 10
Sorry to report .....did you say your name is Cinderella ?
You will not fit my free shoes .
Size 10.........so you must be one of the Ugly Sisters !
Hmm...with your current planned system ie plain pedals and toe straps ??
Big feet 170 cranks and kmx geometry increases the risk of heel strike !
Another factor to consider with your weight and built in front fairing (tummy).
You may have difficulty reaching forward to tighten and release the straps.
Plus velcro will create further niggles ?
SPD and Look plus other cleat systems are fuss free and because of the stiff soles will make you more efficient and of course comfortable .
Unless you had intended to use carpet slippers or flip flops for cycling W@//TY!!!!!
The trike offers static stability so no fears of failing to unclip and falling sideways onto your fellow riders or toppling into a hedge or ditch .
Forum members might well admit to that silly moment .
Sorry I could not help you on this occasion
But do take heed of sensible advice offered by forum members