Puppeteer
Emperor
and a NRE for any BIQ with no map
We don't have map gen code, so that makes sense. The "new game" last I looked just loaded a "default save" file, but since map gen is not mod-specific (possibly except map sizes) I guess we could probably get away with loading a default save if the mod has no included map.
Nutty idea: Short of map gen, I wonder if we could resample a map to resize it? That would definitely work in theory, but not sure how useful it would be for playing nor how easy/hard it is to code. Base terrain sampling should be straightforward enough, but overlay terrain with variations could be weird, and river placement in particular is a different challenge. Oh my, and if we tried it on a map with roads and railroads...nah, resampling a no-improvements map would be challenging enough.
Edit: It should be much easier just to insert more ocean to scale up, but that makes a few presumptions....