My first thought is some Panaracers would look right at home on those rims. They were always good tires and they still come in skinwall. Seems like the modern ones trend narrow though. I'd suggest 24-25 mm for most vintage tubular rims.
I never found tubulars to be any more of a hassle than clinchers. In some ways they are easier. The main thing if you haven't used them before is the unfamiliarity. Have you weighed those? It's a good idea to confirm if they are some reasonable weight for everyday use.