The keyboard I believe has changed slightly in different versions of iOS. Plus with portrait + split keyboard, this seems like it would be kind of a hassle.
I'm also guessing you won't be able to get the correct angle to type well either.
I'm also guessing you won't be able to get the correct angle to type well either.
TouchFire lives in the iPad's cover when you don't use it so if you want to use portrait or split keyboard, TouchFire doesn't get in the way.