It doesn't look like there are any available. Johto Blaziken's map pack appears to only have Four Island, and I'm unaware of any other map packs.
In terms of the Sevii Islands, there really isn't all that much to map. You could easily get PNG images of the maps from Bulbapedia and bust them out in a few days. The maps are generally pretty small and don't really use any tiles in complicated ways (for reference, the GBA has small tilesets and only two layers to work with, whereas RPG Maker has three layers and a very large tileset limit). I'm sure this isn't the advice you're looking for, but it is what it is.