I don't understand what the difficulty is in taking the crypt with this army, let alone breaking through the dwarves??? :confused: Just separate the single marksmen and give them to the vampires. 32 units will kill the skeletons, and then we'll finish off the zombies. We might lose a couple of marksmen and a few spearmen, but we'll get 5000! (although it all depends on the map; if it's a "Jebus" map, you can just ignore the crypt :D, and on a "Small Map" IMHO, you should definitely go into the crypt!)
Personally, I would rather lose in the crypt than wait for reinforcements to take it...
Upload a save file with your army before the dwarves and before the crypt. Why just talk about it?