Do you have a 242 brush? that's the one I usually use for pigments, and eyeshadows and I just checked and it will fit in the vials. Otherwise if you wanted to use a larger brush, I would either
A) press the pigment into an eyeshadow form (I'm considering doing this myself for all my curiositease pigments!)
B) get small twist cap jars (I'd prob get them from a local craft store) and dump a bit or it all out in there. That way its sealed and can be stored relatively easy and then you don't have to worry about taking it out/putting it back in the vial each time--that would be uber messy!
Hope you find something that works for you!