My biggest concern with breeding her, as is yours I imagine, is her consistent leg injuries. But since it appears you have discovered and corrected the cause of that, then that concern is moot.
The horse market up there is quite a bit better than what we have here in the US. Z has very nice, solid conformation, a good temperament, and has proven that she's versatile. You have the sense to go into this thing prepared as opposed to jumping in half-cocked like other folks do. I really see no reason not to find a nice Arab stud to breed her to. I do like the look of the one you posted, he compliments Z's confo and versatility well.