Multiple versions would be good to have, especially as I quite often want to explore and hold a B&W version of the picture without trashing the colour version…
So one thought that _seems_ to work is to make a symbolic link of the original raw file with a recognisable but slightly different name. Nitro seems to see this OK and proceeds to construct an XMP with the name of the symbol-link. This saves on having a copy of the (sizeable) raw file, but admittedly is a bit manual and not an elegant solution.
My question is whether I am building a nightmare for the future by playing it this way?