Convert a cowl or v neck to a shawl collar

I have a couple of basic sweater patterns that im interested into converting. Into shawl collars. Can anyone help me out with modifying it?

I would suggest that you find a pattern for a shawl collar that you like and work that collar into the sweater pattern you have.

Ok cool. Is either one of those a better base for a shawl collar?

My guess would be a basic crew-necked sweater would give you a better basis rather than a v-neck or turtle-neck.

You’d have to see where the differences are in the shaping of the front of the sweater.