I'd also suggest removing /clear, because it's similar to /fill clear. I've accidentally used /clear instead of /fill clear before, and I know other people have too.
/clearinventory would be very difficult to do accidentally, it's obvious what it does and I think it should be the only command to clear your inventory. If people really want to clear their entire inventory for some reason, they can take the extra half a second to type out /clearinventory instead of /ci or /clear. It would save people who might have accidentally used it a lot of trouble.