Switching bow hold

I am playing a slightly simplified version of the blue Danube waltz on the violin, and the peace requires me to switch from pizz to Arco quite a lot actually, and I was just wondering, how on earth should I hold the bow if I have to keep pizz-in and then take a quick rest and then quickly go to Arco again? Should I do it with the index finger or the middle? Or is there an easy strategy anybody knows? Thanks!😊