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I knew "someone" would pick up on that. :)
There are ways of doing it if you really wanted to though. E.g. nuts to retain sprocket (I know, the bolt would loosen as you tighten the nut), removing material and using 3 or 4 bolts instead of all 6, cut the sprocket in half, get a bigger sprocket instead of that 16t, etc.
Pretty stupid though hence my comment that "only a fool like me would try this"
Edit: also maybe you could do centre-lock to 6-bolt with sprocket attached on reverse
Look again. The cutaway between the bolt holes needs to be a larger diameter than the threaded lugs on the hub shell, which is clearly not the case. Even if you kept filing until one passed the other, you'd not be able to get the bolts in, much less tighten them.