One could vibe code a tool which automates that, behind replay pallas the api is public  

Would not reduce the impact of Mercator to his famous projection. As I wrote, he did other things as well (producing an Atlas). Regarding spherical maps, this is specifically a question to the game mechanics, i.e. a unit leaving through one side must reappear on the opposite side.  this might have quite some consequences on pathfinding.  

Just used an old map from the forum for demonstration

So @MarcusAureliu#s is OP?

Small comment: naming a map editing tool "Mercator" while having nothing to do with the ubiquitous Mercator projection would be like naming a financial tool "Crypto" while having nothing to do with cryptocurrency. But this leads me to a bit of an unrelated question: do you think it's possible to make spherical maps? To map a whole planet.