Where are you? I have somehwere in my trove of chemistry a stock of the Tween, which I think is a non-ioning wetting agent. It might be the 200 variant, where a little goes a very long way. You are welcome to some of my stock to get you started.
I think I bought some from a place that sells essential oils, that I use in making my own soap from time to time.
The dumb question that springs to my mind is have you tried photo flo? They are in my mind not very different.
Then I ended up with the remaining stock of a boichem research shop that went though a bankruptcy reorganization.
In this they could not trace their chem status, so under FDA rules all, even the inorganics had to go.
The guy in charge of the place knew me though my kids, and that is how it was gifted to me.