ANything available for 24 inch LCD ?

These are the biggest I've seen and will just cover 23.1" (at absolute max!!), dunno how good they'd be for a 24".... Lens.htm

You'll then have to source a triplet that'll handle that huge size and is matched to the fresnels,
A process lens like that may help, it can handle 16" x 20" (which is actually 20" x 20" because the lens isn't rectangular).