Bear in mind that as the rind begins to grow on the new cheese, conditions may be optimal for early adopters such as Geo or other yeasts to begin work. As the rind development progresses, some early adopters may die off and follow-on cultures kick in and begin to take over, such as B. linens.
With a fully developed rind, you may only get the last cultures that were/are active. Not only that, but you may be incorporating interlopers that have managed to find the cheese during its development or handling. Just a thought....
If the mold on the rind you're trying to recover is PC from Camembert or PR from a blue, your success rate for clean mold goes up dramatically. I have grabbed PR from a
commercial cheese, made a slurry, and added it to the cheese effectively. The PR should be taken not from the outer rind, but from the inner paste where it should be fairly "clean". Other forum members have successfully used this technique as well.
-Boofer-