Interesting discussion about editions. I always thought that to sell limited editions, you had to have established some reputation. At least some of the value of a limited edition print is that after you have sold the last number of the edition - there will be no more made, and the buyer needs to have some confidence in that fact.
Cut negative on 10 or 12 pieces,put it on small plastic bag and glued on the back side on every photo from limited edition.
Now we have limited edition from this negative.