Quickest way (ETA: quickest way without actually having visual hets to work with) with best odds would be to get two visuals, breed together, then breed the double het offspring together. Next quickest would be to work with double hets (but you'll have a smaller chance of getting your double recessive).
I'm planning on hypo axanthic ("true ghost") in the future. I have a pair of axanthics and a pair of hypos to accomplish this. I'll be breeding the hypos to the axanthics, then breeding the offspring back together in hopes of hitting the double recessive. It'll take a few years to complete.
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