For something like this I think the best way to approach it would be use Add blending rather than dither, and turn on Include Diffuse, and paint your alpha content into the Albedo map itself. You can plug it into the emissive slot too if you want more glow.
Ah ha! Thank you @EarthQuake! I know that marmoset isn't really meant for the handpainted stuff but I will most certainly give this a shot and report back!
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