Shader Graph Help - Custom Crosshair/Reticle Texture - VR

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I’ve created the attached shader graph by following this tutorial: How to make Scope shader | Shader Graph | Tutorial | VR | Unity.

It works almost perfectly for my needs, but I’m hoping someone can help me figure out how to replace the crosshair with a custom texture with transparency that I can assign in the inspector, and also modify the texture’s scale in the inspector. This texture will contain a custom reticle/crosshair, rather than drawing it with rectangles as the shader currently does. I’d like to maintain the ability to change the crosshair color in the inspector as well.

I feel like this should be fairly easy to do, but my understanding of shader graph is pretty poor. I’d really appreciate some help.