you could try creating your world with just the mods that change world rendering( whatever adds the ore's, volcanos and rubber trees), run dynmap, and then you could just transfer the world file back over to tekkit lite?
alternatively just take the seed you want, generate the world in vanilla, run dynmap, and there you have a version of your map, but without the new structures ores and plants...
i cant help you with how to run it alongside tekkit lite tho, sorry, hope i helped.