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After 4+ hours I finally managed to automate a cubemap to irradiance map workflow. The results are satisfactory! Good to know ambient cubelights look good w/o makeIrradiance and with a proper IR map. May post a tut later.
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IMO Irradiance maps is pretty confusing term, as it hasn't been used much in games for a long time now, but this is a closest thing to explanation: https://learnopengl.com/PBR/IBL/Diffuse-irradiance
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Writing up a tutorial now. Took me a long time to research some open-source alternatives to apps and troubleshoot all the problems you can run into, but now that I've probed all options I think I have it figured out.
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Nice tutorial so far! It's great to see this works so well without needing to bake a lightmap as the input lighting.