The 'bottom end' if I recall is cast into the upper intake manifold. You can't take it off unless you take the whole UIM off, and even then you're at the mercy of nimble fingers and deilcate cleaning.
If its just you, and you have no way of blocking the throttle plate open, take the TB off and attack the problem that way.
I know, inconvenient. But hey, its brilliant engineering, right?