I haven’t checked out the Phonak options, but my Widex Charge n Clean has a very quiet built-in fan and external vents for drying. The UV LEDs are placed at several locations, so shadowing would likely be minimal. UV does transmit through some materials, including clear/translucent silicone. At any rate, they won’t contribute appreciably to the drying effect.
The charger was included with my HA order but can be a bit pricey if purchased separately (>$200!).
I hadn’t thought about the plastics’ UV resistance (or lack thereof) …that is a concern. I think it would be good to identify those materials and their properties. Silicone is known to be highly UV-resistant, as is PVC, but are those cables PVC-jacketed?
I might cover those LEDs with some light-blocking stickers, unless/until it’s shown that it’s not an issue.