OP, you might look into a surround sound system that has and auxiliary output that could be used for the hearing aids. In this case, I would go to Best Buy, and explain to them exactly what you want to do and have them verify that you can have the surround sound speakers on at the same time as the auxiliary output. NOTE: the volume control will most likely control both outputs, so the hearing aids will probably need to be adjusted separately with their own control.
IMHO, I do not believe you will find a TV set that will do what you want, we have 3 in the house, all different brands and all assume that if you are using headphones you do not want the speakers on, and the adapter you are using plugs into the headphone jack. The only other option would be to see if there is an OPTICAL output on your TV, and then find an OPTICAL to headphone adapter. It appears that the optical output is always on.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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