Yes, any qualified LDS can swap it either way
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I know that one old Sherwood reg had the yoke cast as part of the first stage body (4000# service) so there was no conversion, I don't know if there were others built that way by any manufacturer.
Yes, I'm wondering about the Sherwood Maximus (srb5600), one of the relatively newer versions (that's as close as i can get), that have the newer matte grey finish on the 1st stage, rather than the older shiny silver look. I'm considering a couple of these that currently have DIN compatibility, so I'm wondering if it's possible the DIN fittings are factory-original and permanent (but able to be altered with the common screw-on yoke adapter), or if these DIN units might be removable.