Unless you truly need a nested arrays-of-arrays API for some reason, why not just construct instances of your structs for comparison in the tests and skip implementing a bunch of other stuff that it seems you want just so you can build tests? Nested arrays of arrays become hard to work with because there’s no information to identify what they mean.
@test region.geo.ctr ==MTKt_GeoCoord(67.2, -95.3)