I don't know about replicating a cropmark, but you can do a "manual" registration with Roland (at least, our XR-640) that involves setting basepoints instead of reading crop marks. We use it when a cropmark gets damaged or won't read, and it works well but is time consuming.
I've never tried this, but theoretically you could. But you'd need to be quite precise with your two separate files - your printed file, with 4 corners marked precisely, and your cut file, made exactly the same size.