I have Wild Blue. My system is a KA system. The dish looks big enough to work on Ku, although I've never measured it (it's up on top of my garage).
However I think that the older Wild Blue dishes were Ku dishes, so those might be even better suited for Ku FTA.
The only issue with MY Wild Blue dish, is that it is a double reflection type of thing, sort of like those torroidal dishes. Ie the lnbf doesn't look at the dish itself, but away from the dish towards a little reflector plate. Shouldn't be an issue, but it's an added parameter to consider.