Viking Allrounder Serial No. 120263

from cp's

^
I say give it a clean up and leave it as is. Perhaps new pads, chain, sprocket and cables.

This bikes spent 60 years in this state, and is designed for it, putting bullhorns on in would be like dressing your grandmother up in wet look leggins, an oversized T-shirt that says something like "WTF IDK" glasses with no lenses and DM's.

Just buy another singlespeed bike.