Hello, and welcome. I started in on vintage bikes with a '74-'75 Motobecane too. I usually cycling specific hybrid type shoes. They are rigid on the sole for energy transfer, etc., but I can walk around all day in them. Anyway I've tried to clips with straps very loose and, despite practice I still have to look down to get my second foot in. Seems very fiddly. I bought Velo Orange half clips and have them on some classic looking MKS Sylvan Touring pedals and have no problem just simply riding. Don't even have to think, and my foot knows right where to go.