Alpha colour blending?

Is it possible to get colour blending with alpha images?

Alpha seems to blend fine, building up with repeated draws, but colour just seems to replace the existing colour rather than blending with it.

I know it’s not RGBA and so still limited to the indexed colours, but is it possible to change colour to the palette’s best fit for the blended RGB value?

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It’s something I also have in mind, but as an option. It’s possible to do so.