I'd play them
I was really thinking of the empire when I said that, I'm not sure how easy it would be to make an EA and LA empire. Although I do seem to recall you having said something about them before, now that I think about it.
EA lizardmen sound a lot stronger than la lizardmen though, even without the skinks. It might be hard to balance them for something like an all ages game, not that it's really that likely you'd see one with multiple ages of the saem mod nation.... If you do it like that, there should be some anti-skaven flavoured spells for the priests of sotek, or maybe some kind of disease immune creatures. Hmm, I don't think there's a tag to be just immune to disease though without being a demon/undead. I guess relying on poison resistance to show their anti-skaven bent isn't so bad, but if you're changing the la skavens to be more disease-inducing it won't quite be as helpful for that.