templates VS localtuya

Setting two on/off cycles with 50 discrete schedules seems like a very inefficient way of doing this when the same thing could be accomplished with two rules. Any compatible device flashed with Tasmota or similar FOSS firmware would make this possible.

Have a look at https://templates.blakadder.com

Another WiFi based option is any compatible smart relay or switch flashed with Tasmota. In Tasmota, SwitchMode 15 decouples the switch state from the relay and sends status changes via MQTT to HA.

2) If you want to switch on/off the light switch in your room, your best bet is to replace your regular light switch with a WiFi light switch. (Yes, you must have some electrical knowledge to do this. But trust me, this is best, most reliable way.) See https://templates.blakadder.com/ for some good devices. Many of them can be re-flashed, so instead of using "their app", the light switch can be a web server that you can talk to from any computer on your network (including your laptop, your phone, etc).

If you're familiar programming ESP boards take a look at this repository of compatible devices.

Wifi switch, I suggest one that runs tasmota. Blakadder website seems to help.

I cannot find the correct model for this plug. On the back it says "WiFi Smart Plug / TWSP017" but I cannot find any reference to this online. I looked at the (long) list of pictures of plugs and sockets at the templates.blakadder.com site, but without finding anything that looks quite like it. There is one power socket, one LED (that never seems to be lit) and one button on the left side. It is a square shape with rounded corners; too generic a description to be useful I'm afraid.

You mention incompatibilities. I am not 100% what you mean but here's a link of Zigbee2Mqtt supported devices and Heres a list of tasmota supported devices . i'd reference these before buying anything.

Tuya devices, and the Tuya-based Monster, Greeni, etc stuff can be connected to HA using the Tuya Integration, or converted to local-only using Tuya Cloudcutter and connected to HA using Local Tuya, or even flashed with Tasmota, ESPHome/Libre Tiny, or OpenBeken.

It's still on my list of things to try so I don't have personal experience, but I think https://github.com/rospogrigio/localtuya can help you. Maybe start with reading the readme to see what limitations exist for Tuya devices.

localtuya

You can control them locally with this integration for Home Assistant: https://github.com/rospogrigio/localtuya

We got some cheap Tuya bulbs from Kogan. Unfortunately they were too new to flash with tuya-convert, but they can still be controlled locally through Home Assistant with localtuya.

There is the [Local Tuya](https://github.com/rospogrigio/localtuya) integration for Home Assistant. This will eliminate the cloud dependency of the Tuya devices you have. Once you have them in Home Assistant you can expose them to HomeKit just like HomeBridge does.

Don't the Treatlife devices just use the Tuya backend? If so, you can add them directly to HA using the cloud based official Tuya Integration, or the local-only Local Tuya via HACS.