I'm sure it is, just requires some grinding on the tang. You'll see the 'back' (opposite of the blade) is round, if you make that square, it'll half stop. (at least, that's what I think)
If you just flatten it off, make it look like the tang of the bottle-opener, it'll be alright, I think.
*disclaimer: I haven't done this, but it does make sense, somehow, right? Can't -promise- it'll work good, though.
Oh, and make sure you round the corners off just right (so, grind slowly) Or it won't be very nice to close it, or open it more than the half-stop.