Plate Reverb... just plug in.

This is one of those things where I guess I knew in the back of my head there must be somebody making ’em. It just never occurred to me to look. Have a gander at Platesonics, AFAIK the only current builder of plate reverbs. And, while I’ll grant that there’s no EMT 140 in their arsenal, these guys make some inexpensive plate ’verbs, and judging from the MP3s they’re not bad at all.

So ditch that IR and get yourself a #2400 Chamber Room for $692.