Hi again. I found this thread after your comment in the thumb over the top discussion.

Interestingly, I played guitar for over 30 years using my index finger and thumb pinched together to strum. Almost like I was holding an invisible pick. It's only the past 12-18 months that I've forced myself to use a plectrum. I found, for me, it's easier to strum by showing just a tiny amount of the pick. Maybe half a centimetre. Another issue I have is that the pick moves a lot when strumming more vigourously. I believe this can be fixed easily be applying small adhesive grips, which can be bought in most if not all guitar websites/shops. I've yet to try this myself.

hope you find a way to make it work. Good luck.