Zigbee Green Power Proxy (GPP) devices?

I am hoping to use a Senic Friends of Hue Outdoor Switch as a doorbell button.

UG103.15: Silicon Labs Green Power Fundamentals suggests that a Green Power Proxy (GPP) will be required to encapsulate the Green Power Device frame sent by the switch to a standard Zigbee frame.

I understand that some Philips Hue devices can act as a Green Power Proxy. I have several Philips Hue bulbs and luminaires that are mains powered.

However, I would like the doorbell to still work if the mains devices are unpowered. The bell sounder will be a battery powered smart speaker. Will any battery powered devices like a Philips Hue Motion Sensor work as a Green Power Proxy?

My Home Assistant host is on a UPS and currently has a Electrolama zzh. I also have a SkyConnect. Can either of these act as a Green Power Proxy?

Any other potential problems with Zigbee Green Power support?

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Came here with the same question. Did you find out more? @JohnConnett

I don’t think ZHA supports Green Power.

Edit: Z2M seems to, though.

And even if it did, a Hue Motion Sensor or any battery powered device will not translate the Green Power frames to regular Zigbee frames.