PlotStyle - Switch Missing Style to Non-Missing Style

I am trying to convert all missing PlotStyles that are missing to one that is not missing.

I am working with the Style Manager and Display Manger. We use a custom .stb and in this custome .stb we have eliminated some of the standard PlotStyle Names such as Full Saturation, well as you may imagine some of the default materials, walls etc... under Style manager reference Full Saturation, right now I am going in by hand, one by one, changing this to AsDrawn.

Is there a way I can automate this for two purposes?

1.) so I don't have to do this all by hand

2.) as we "copy" elements from older jobs we can macro the change of plotstyle and so when we get drawings from outside we again can macro the plotstyle to AsDrawn.

Thanks