Yes, technically. But if you don't want to buy NBS, then please buy succinimide or at least succinic anhydride - those two are not watched the least. Aqueous bromine also does the same job as NBS, but not as cleanly (= lower yield). But a whole lot less work than your proposition, I promise.
Also, it is much easier to make aminorex analogs from PPAs using potassium cyanate than with cyanogen bromide - the former is non-toxic, the latter is a vile volatile poison.