Your grape approach is called layering (as you probably know). There are lots of way to propagate plants, some respond better to one method than another. I haven’t propagated grapes, but I have propagated lots of other plants mostly with intermittent mist. Thousands and thousands of cuttings. If you just want a few copies, then layering works fine, if you want thousands, then you need a different method.
There are so many hybrids of grapes, how do you think a college professor would know exactly what you have? It would likely require a DNA comparison to know for sure.
Michael Dirr (now at UofG) is a good source for plant IDs and propagation methods. He's written lots of books on the subjects.