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I don’t think any way that’s compatible with code. Even my house which is also old has two separate chambers in the chimney for the fireplace and the boiler.
Last house, I was remodeling the upstairs and found the chimney in the wall had an opening like yours for a heat register box. Wasn’t sealed other than a 10 inch square of tin and some tack nails. Good god. Bricked it in and lined with seamless stainless when I replaced the boiler.
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