I checked VeloCals and they have some Hercules decals.

https://velocals.com/hercules-hawthorne-decals/

https://velocals.com/hercules-amf-do...decals-1-pair/

This one from Thailand looks good.

https://www.ebay.com/i/323304619557?...SABEgJC0fD_BwE

This looks like one of the styles that you described above, colorful and nice vintage looking graphics, maybe 1950's. I'm no expert though

https://www.ebay.com/c/1631929654

This one from England on Ebay in the UK has an older style to it, with nice color.

https://www.ebay.com/i/253346592487?...yABEgLJ7PD_BwE