One local company springs to mind for this sort of job: http://www.glassactuk.com/image-glass.asp - It won't be cheap though...
If you wanted a low cost option, how about printing on to acetate and then sandwiching the print between two thin sheets of glass.
By "entirely opaque" I presume you mean passes no light?
Because most film emulsion even at Dmax is not truly opaque.
if silver emulsion dmax is sufficient, John Nanian (jnanian here) has worked with glass plates and liquid emulsion.
And I'd rather not deal with jnanian.
I've dealt with John. It's always been an easy experience. I'd recommend him to anyone.
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