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Many countries don't allow military cartridges, but most of the time it seems the workaround is just using the closest one. Like 7-08 for 308 or 380 for 9mm or 222 for 223. But I don't think any of those cartridges were conceived to skirt laws, they just were close enough.
9x21, for where 9x19 is prohibited. Same COL as 9x19 so any existing 9x19 could have the chamber reamed. Irony is that lots of 9x21 will probably shoot 9x19 with the extractor holding the case against the slide, just like .40 in 10mm.
And the .500/465 Nitro Express, .470 Nitro Express, .475 Nitro Express, .475 No. 2 Nitro Express and .476 Nitro Express were all developed to get around the British ban on .450 caliber rounds in India.