Can I Plug Up My Manifold?

I not sure how to explain my question. I have a 89 chevy silverado and the other day while I was tightning the bolts up on my manifold I accidentaly broke off the hose that goes from the manifold into the heater core. Now there is a piece of pipe still stuck in my manifold I cannot get out so I can get a new heater hose in. I have tried all kinds of extractors, and even tried beating it out with a hammer and screwdriver but im a afraid ill mess up the threads. I cannot afford to take it to a shop and was wondering if it would be stupid to just put a big bolt in the hole and plug it up? I would also have to byp my heater core from the radiator which I dont think is a big deal. There would still be one hose on top of my radiator sending coolant into the engine and one hose on the bottom of the radiator taking it out of the water pump. Hope this all makes sense.