UK Zigbee dimmer switch - router, 500w

Can anyone help me source a Zigbee dimmer switch? ChatGPT and Amazon searches are not coming up with the goods.

Requirements:

  • UK wiring
  • Zigbee-enabled and compatible with Home Assistant.
  • Must act as a Zigbee router/repeater, not just an end device.
  • No neutral required — existing switch box only has:
    • Live (L)
    • Switched live (L1)
    • Earth
  • Must control the existing 12 × 34 W G9 halogens = 408 W total.
  • Ideally rated ≥500 W halogen/resistive, with some sensible margin.
  • Manual local control of on/off and dimming.
    • Existing rotary control is preferred, but rotary isn’t essential.
    • Touch/button control is acceptable.
  • HA control of on/off and brightness.
  • Suitable for voice control via HA/Alexa etc.
  • Must fit the existing UK wall box, shallow box (35mm) - but can create a deeper one if this is a limitation.
  • Prefer brushed metal/chrome/ white glass or another non-white aesthetic — avoid plain white.
  • Ideally a drop-in replacement/module so we don’t have to replace the whole fitting unnecessarily.
  • Target cost: preferably ~£25–40, because the primary objective is improving the Zigbee mesh rather than undertaking a £100 lighting upgrade.
  • LED conversion is not currently required. Existing CRI >99 halogens are perfectly acceptable and should remain unless/when replacement becomes worthwhile.
  • If LEDs are considered later, they need to be compatible with the chosen dimmer and preferably 2700 K, dimmable, CRI ≥90

Must act as a Zigbee router/repeater

This will be the issue, no neutral devices don’t act as routers.

I would consider putting a dimmer relay in the light fitting, you will have both a live and neutral feed in the light fitting.

Search these forums for Repenic. They cover most of your requirements (not sure about the router part).

However be advised that they’re not cheap - their dimmer costs 2-3x your budget. Might be cheaper to install a dimmer module in the ceiling as @Arh suggested.