I used a 3d print which was processed and painted accordingly. Maybe if someone printed this in resin, you could cast this in latex? Not sure how this works exactly, but here is a link to that file:
Model available for download in Stereolithography format. Visit CGTrader and browse more than 1 million 3D models, including 3D print and real-time assets
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The size you get by default is in 1:6 scale, but I simply scaled mine up to 1:1. I think it looks very convincing.