I agree with the above posters in that I expect that the "browning out" or "holding its color" traits are set by other genes inherited from the het parents/grandparents, rather than by any of the axanthic genes themselves. So I expect line breeding specimens that hold their color would be a better way to produce "true axanthics" than combining the different lines.
That said, I still think you should go for it! Just be careful while you're doing it that you don't ever mix up the tags marking which axanthic het-for-other-axanthic is in which tub...
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