the com pilot 2 is supposed to pick up any BT signal and then use T-coil to get it to the aids. Since you iPhone already works and the Bt protocol is the same on the watch, I would assume it’s safe to say, yes.
Best just try it 1st in an apple store.
"You may be able to see then why the Apple Watch doesn’t really make me feel like I’ve gained anything in terms of being able to respond to notifications. In fact in some respects, it’s a step back. I don’t like the noise pollution of it speaking out-loud through it’s little speaker. I can get rid of that by pairing my Phonak ComPilot with the watch. The first time I tried this, I couldn’t get it to pair despite repeated attempts, however a reset of the watch got me up and running. The level of VoiceOver was extremely low, but I discovered that Bluetooth audio seems to have its own volume, and by performing a two-finger double-tap and hold, then sliding up with two fingers, I was able to raise the Bluetooth audio volume to 100%. At that point, the audio was at an acceptable volume, but issues persist. "
so the guy connected on compilot 1 with an old apple watch. Don’t see any reason why it shouldn’t work with 2 and the new watch.