How can I manually tell the TileLayerOptions to load and paint a tile?

[JaffaKetchup]

I need to do this as I'm implementing a way to remove grey tiles, but I can't change the base code in flutter_map. See JaffaKetchup/flutter_map_tile_caching#12.

My existing code:

@override
ImageProvider getImage(Coords<num> coords, TileLayerOptions options) {
    // `preloadSurroundings` is a boolean dictating whether the grey tiles should be attempted to be removed
    if (preloadSurroundings) {
      for (double x = coords.x - 6; x < coords.x + 6; x++) {
        for (double y = coords.y - 6; y < coords.y + 6; y++) {
          /*_CachedTileImageProvider(
            getTileUrl(Coords<num>(x, y)..z = coords.z, options),
            Coords<num>(coords.x, coords.y)..z = coords.z,
            cacheName: cacheName,
          );*/
         // How can I manually load AND PAINT the image above
        }
      }
    }
    return _CachedTileImageProvider(
      getTileUrl(coords, options),
      Coords<num>(coords.x, coords.y)..z = coords.z,
      cacheName: cacheName,
    );
  }

[JaffaKetchup]

Please see #966 for all further discussion.