The only real problem with this idea would be the supposed 'waste' of an asset as considered by the Empire(s) involved in the process. Remember that the "genetic lottery" that allows Capsuleers to be Capsuleers don't ACTUALLY allow them to fly a capsule - it just let them DISCONNECT AND GET OUT without turning into a vegetable locked up inside their own numb bodies.
There would be no problem at all for any Empire cruel enough to pull any random Joe and Joeline off the streets, kit them out with the proper implants and theoretical training then put them in a pod and let them STAY there forever. Sure, they would be little more than organic batteries running the pods and would die for good when someone pods them, (puts them out of their misery) but that's when you grab a few more random dudes and enslave them to a pod for the rest of their time as well.
Far as the Capuleer to Duster transision goes, AFAIK there is nothing special about the Dusties that makes it a niche thing, like the Capsuleers. Anyone can be trained and modded to become a Dustie - even Capsuleers, I'd think - you just can't reverse the process and losing someone that has the rather hard-to-come-by ability to enter and leave a pod at will without mind-lock would be considered a HUGE waste, because as stated, anyone can be a dustie, but not everyone can be a "true" Capsuleer.
If I'm wrong about this then the *edit*
whorewhole *edit* thing goes out the window ofc, but if I'm right nothing says "Aria can't convert to a dustie" but lots say "Aria converting to a dustie would be a huge waste of skills and abilities" - provided ofc that Aria herself give a shit, and I'm assuming here she don't