I have a sizing tool that has a small dull shaft on it and I use that to clean them out when I got that route (mostly I tumble after if there is any build up)
Not a clue what would happen if not cleaned but not going to find out!
I bought a cheap air compressor and just blow the media out with a quick shot of air. Also removes tumbler dust.
You might want to rethink that and go with a mechanical pin, punch or the like.
The dust won't be good for you