I thought there might be a way to tailor them (maybe even fit them over the top of the boot?), & my wife is pretty handy with needle & thread. Per the ad the seller has quite a few pairs.
I don't know why you couldn't just cut them off and hem them like regular pants. Might have to move the bottom velcro strap, but that shouldn't be too big a deal. I'd take a pair, hemmed or not, if you decide to go get some. Right now all I have is chainsaw pants that are way too long. Chaps should be easier to hem than pants, I'd think.