I run a pair of Unity fog lights with amber bulbs on my '50, and I turn those on to use as DRLs. I like using them because the tail lights are still off, so there is plenty of contrast between the completely 'dark' tail light lenses and the illuminated brake lights. That's the idea, anyway. Not sure if something similar will fit your uncomplicated front end theme- If I wasn't using the fogs, I'd probably just run the headlights. I'm not sure why they'd need to be dimmer in the daytime, since regular headlights don't seem too bright in the daytime anyway.
