Golgotha's Masters of the Universe - Future Forge Online, Pop Miniatures.

 Herewith, another possible source of miniatures that are available via Etsy. They are certainly not ideal but the Beastman in particular could be useful as RN Estudio does not seem to do one. These are however 40mm not sure if the seller would be willing to rescale?

https://www.etsy.com/uk/listing/1244937201/skeletor-and-the-evil-warriors-villains?ref=sim_anchor

https://www.etsy.com/uk/listing/1244935845/he-man-and-the-masters-of-the-universe?click_key=5cac6bd767474619ab7fce899610a2906d637cef%3A1244935845&click_sum=889a7d3b&ref=market_rv-1&sts=1