I don’t know where you are in the UK but have you contacted Sensory Team (part of social services)?
They funded me a TV Loop System, Bone Condiction Landline, flashing and vibrating fire alarm, flashing door bell and vibrating alarm clock.
Or you could buy a Loop System from here and that would work with any future update of NHS aids.
Sarabec LA240 TV Loop Amplifier | Connevans37
Connevans
The issue with getting the Phonak ComPilot system is when he upgrades his Aids with the NHS, he’ll have to replace the ComPilot system.