I have a couple of PVD watches.
My BFK (SKA427P1) certainly has patina, though none of it was "forced", and it remains one of my favourite beaters.
So far as modding, all I've done is switch the regular Hardlex crystal for a domed sapphire. I do have a set of different hands for this movement, but haven't got round to changing them yet.
My other is a black Scurfa that was knowingly DOA when I purchased it. Having replaced the movement I now wish I had added a domed sapphire to replace the original flat one.