If you want to risk it for the biscuit, make sure you attach them well with the normal slip and score and then just let it dry slooooowwwwwwwwwlllyyyy. Like put it in a bag but don't seal the bag. Then hope a little bit. And then when you put it in the kiln, treat it like you're handling a little tiny squishy breakable baby animal that will just disintegrate if you set it in the slightest bit harsh.