I’m running the same hardware but I’m on stable. I can’t get past the Konami logo either.
Have you tried ProtonGE/ WineGE?. Is has codecs that regular proton and wine don’t ship with.
Try spamming the space bar on startup and choosing an older kernel
Pop Os uses SystemD and not GRUB
According to this support article, they are still allowing downloads
https://support.apple.com/en-au/guide/tvapp-windows/atvbe9ddc3f/1.4/windows/10
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https://lutris.net is the place to see how well your games will work with lutris.
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Might have to right click and make sure it’s executable, then double click it to install.