Selective breeding of Phelsuma grandis to eliminate red

I’ve been keeping and raising high crimson giant day geckos for a number of years. I recently acquired a male and female (wild caught) Phelsuma grandis that lack any red spots or markings other than a red chevron on the head. They are quite beautiful and I intend to keep them together to produce offspring.

My question is: has anyone attempted to selectively “breed” the red out of them? I’m wondering if an all green male and female will produce offspring that are all green or will they have red spots? The female appears to have a faint blue cast to her so perhaps she has the blue blood gene.

If any one has any experience with this, I would appreciate your feedback.