If it were me and I had that basement that could be made use of, I would seek to achieve what you have done with your mid-bass horns in the loft. I know that you considered and dismissed the tapped horn idea some time ago but it would cost very little for you to experiment with it as opposed to the dual rotary woofers or home-made black hole solutions.
If the results are to your liking then, you might consider doing what I will do long term when I have a room with adjoining space either in the form of a basement or loft space (provided I like the results that can be obtained from a tapped horn). I would have the mouth of the tapped horn coming up through the floor at the appropriate point and hide most of the tapped horn itself in the basement. The top part of the tapped horn would be a coffee table or side table and neither you nor your guests would even know that it is there.
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