FYI, those are only the basis for the design, not the actual shoe, but I'm sure you can judge that with the provided image. The toe cap is a completely different molded plastic of some kind. Not sure how accurate you're going for here, but if you can find these in the same colorway, then you really are off to an awesome start.
Through a combination of exacto knives and a heat gun, you can easily remove all of the uneccessary parts of the shoe, they it's just a matter of attaching it to the foot of the costume using a combination of Shoe Goo and sewing.
So if I were to get a size 7.5 when I'm normally a 10 with plenty of room, would that be okay? I know this thread hasn't been used in a while, but I wanted some conformation before I purchased some. Thanks!