I used a variation of this solution to solve a similar problem! Sharing in case it's helpful for you too. https://help.simplebundles.io/article/85-hiding-bundles-from-shopify-packing-slips Just change out -BUNDLE for the skus of your non shipping pro...

SAME PROBLEM!!! It's wasting a ton of paper for us and driving our fulfillment team crazy. Ours is with Route Package protection too so it's sadly NOT an eco solution for us

Having a similar issue. When I try your solution I get this error from Shopify. Any other ideas? It's a serious problem for us.