Wouldn't it be as easy, and possibly as cheap, to simply order plastic hex bases and glue the image cutouts to them? Litko, Chessex, Gale Force 9, etc. Where you want a permanent row of 3 hexes, or more, glue them all to a plasti-card template maybe?
It sounds like you'd want flat hex bases, but I think you'd be able to buy those just as easily as the recessed ones.