"You stupid American! You want what? Clincher wheels, instead of beautiful tubular? OK take these. Pure steel. Dumb English size."
Bike boom bikes that would have normally come with sew ups sometimes subbed steel 27" clinchers. It was a thing. 700c clinchers didn't realistically exist yet in N. America.
Stop torturing yourself and put 700c wheels on it. Or convert it back to sew ups.