In my experience, its better to put a few drops of MEK onto the striker pad and scrape with a razorblade, all the P comes off in one go, and no filtration is needed, and it also avoids the risk of lead contamintaion from using shot
Maybe you could try using the long cold-cook ala warlock and use a vinegar bottle, they look about the right shape, I don't think they would be good for much in the way of heat, but you might try cold-cooking it long and slow, read the super high potency push-pull thread,
I'm thinking of having a crack at this dream myself soon,
good luck