Okay, so this is my first post. I have a set of the credit-card sized DMT stones, but they only go up to 1200 grit. I also have a 12000 grit Chinese water stone. First of all, can I go right from the 1200 stone to the 12000 stone without using a 400/800 stone in between? Secondly, are there any small portable 400/800 stones? I'd like something I can travel with for an extended period of time, and the 12000 stone is already the size of a tank.