That's an interesting idea. Or, one could try to publish it independently, then induce TI to sell it in their store.
Selling it in TI's store could work, but I think bundling them together is better. The primary reason is because that way people will end up buying both regardless of if they know about TI's online store -- most people don't even know that TI has an online store, so I don't think the number of buyers would be very big if you went the TI online store route.
Concerning the matter of content, I don't even think that will be an issue. I think there is easily enough content to get a 100-150 page book. That seems like a good range to shoot for, since people don't want to have some daunting book to read.