I can't help much on the crozius, but I can tell you that simply replacing the entire chainfist arm isn't all that terrible. I'm converting mine with a lightning fist, and I found that the cataphractii arms can work with a little trimming. You just cut down the "straps" from the arm until you can fit it in the slot for the body (you may have to shave away one of the straps from the body as well), and you're good to go. The straps are a slightly different style, but I plan to cover the area with purity seals anyway so it's easy to hide. You could also just do some minor sculpting with green stuff.
Maybe you could use a cataphractii sword arm, and then replace either the weapon or the whole hand with something more appropriate.
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