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Hi Pocahontas

I am probably not understanding what you mean by "does not scale" so further advice until I understand better may send you in the wrong direction.  I believe Photoshop is doing exactly as you are asking and there may be a misunderstanding of what is needed when you use a custom pattern in the conversion.

As the next step I suggest you look at the following link which may help you along with your project.  The pattern size needs to be significant enough in size relative to you image size to show up the pattern very well. Hope this link helps:

John Wheeler

https://helpx.adobe.com/photoshop/using/converting-color-modes.html