(I'm not deaf, and barely discuss with hard of hearing people, so I'm likely not relevant)

Main factor should be to ask him, to better understand how he "works around". "Best case comparaison" for video conferencing is IRL meetings. Does he feel "comfortable" with IRL meetings assuming proper lightning and face orientation? If not, then it's likely there is no fancy video conferencing that'll be ok, and just forget about video conferencing.

Assuming he reads lips, better video overall: Give all co-workers better cameras and lighting, check that Microsoft Teams doesn't compress stupidly (if it does, maybe try other systems...), have your coworkers frame the camera properly on their face. Better mics if he can hear a tiny bit.

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