I'd love to find something like these! I think you should pick a stack and carry it around with you for a week, with some thread and a needle. See if you enjoy stitching them together during "down time" like riding as a passenger in the car, waiting for an appointment etc. as much as I do. You might really enjoy yourself and find that you aren't as clumbsy as you believe you are! If you can sew down binding, I think you can sew hexies... but if you have a bit of arthritis or hand/wrist issues it might not be for you. I agree that if you don't enjoy them, there is a ton of people, including myself, that would buy them!
*also you can just applique them if you want, there are lots of people making pillows and table runners and pin cushions with individual hexies appliqued onto a background