I just had another think about this because one of the restaurants I got into the kitchen of definitely used Patak Balti paste as the extra spicing for their balti curries. Now, I'm not saying this is going to produce the best baltis but, it just might be what Deni is after...or not!
Anyway, what I would do is cook some minced lamb on a medium heat with a few teaspoons of tandoori masala powder and undercook it slightly, and then, as Jerry suggested, use this in a standard curry but also add a couple of teaspoons of Pataks balti paste.