Blending layer in Luminosity mode without the details (only for transfer of the "contrast")?

I found a way to somewhat do it.  Not ideal but it sort of does the job (for my current use/application).

• Make a duplicate of the base layer then merge it with the layer you would want in Luminosity mode.
• Copy that image into a new tab/project.
• From the Neural Filters, use "Color Transfer" with this image onto the original base layer and bump the luminosity up to, seemingly, max to match the contrast/luminosity of the original image with the originally intended other image (or otherwise adjust the slider to your liking).

This works because you've essentially made the colors the same through the initial blend.

If anyone has a more direct solution that doesn't inolve Neural Filters, please let me know >.<

Thanks again!

Duplicate the layer or file, fill with a neutral such as white, black or any gray level in color blend mode.