homebridge-shelly VS homebridge-leviton

The only thing I could think of is using something like a Shelly Plus 1 in HomeKit (firmware/Homebridge paired to a strike of the appropriate voltage.

This or this.

You could use a generic LED strip and a Shelly RGBW2 flashed with shelly-homekit or use it without flashing through homebridge-shelly

They’re not HomeKit compatible by default (nothing DIN rail mounted will be) but could potentially be supported using Homebridge depending on which relay you go with.

homebridge-shelly

Yup! This would be my recommendation. A Shelly 2.5 if you want to add two independent circuits to HomeKit. Not native, but works fantastic! The Shelly can be added to HomeKit via a Homebridge plugin or (my personal favorite) Mongoose HomeKit firmware. Plus you can still use your normal-looking wall switches!

Either a Shelly 1, 1PM, or 2.5 depending on if you just want on/off, power monitoring, or need a dual channel option. Can be integrated to HomeKit via Homebridge or my favorite, Mongoose Shelly HomeKit.

And then as CautiousAd said either Mongoose HomeKit Firmware (my personal favorite) or Shelly Homebridge will get you up and running 👍🏼

I can't recommend Shelly enough, the Shelly 1L is a no-neutral relay that can go in behind your switches and tends to be pretty solid. You can control them through an app, flash with shelly-homekit, or use homebridge-shelly to control them.

I‘m not super familiar with Leviton switches and outlets, but it looks like there is a Homebridge plugin for them. I realize you said you wanted to stay away from that but using the existing outlets & switches it may be the only option but I can’t say for certain.