If you have a new smartphone. It is strong enough ram and battery. To be like some kind of bridge, it would receive the auracast stream and decode and encode the signal so that it can be received, for example, by hearing aids that use Bluetooth classic.
I thought your hearing aid had to be able to connect to an Auracast broadcast. I don’t think the Philips 9050 has the necessary update to receive an Auracast broadcast, even if you have a Pixel 9.
Unless a smartphone has dual bluetooth chip, it’s going to be a dongle system like the floogoo and co.
A dongle that receives an Auracast stream, then send it to the smartphone via USB, the smartphone then send a signal to the hearing aids using classic bluetooth or LE audio.