Of course you could, you can house a BP in anything as long as you make them feel secure and provide them the right gradient. My BP is in that exact size of cage, and does fine.
I wouldn't let a fear of IBD prevent you from getting a boa. Snakes are animals. A BP could be sick too, or having something to pass on to the rest of your collection. If you practise appropriate quarentine procdures, which is the same no matter what species of snake you're keeping, and additionally you make sure not to share anything inbetween your boa and BP cages, and to wash your hands between handling, then you should be fine.
I would also recommend picking up your boa from a breeder, instead of a pet store or consumer to consumer site.
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