Sonoff Bridge RF DIY Multisensor - Battery powered

Hi, I would like to create a MultiSensor which consists of:

PIR Motion Sensor
Temperature and Humidity Sensor
Lux Sensor

I already have Sonoff’s (Tasmota MQTT) controlling lights, etc, so the idea is to have this multisensor in each room, detects someone entering the room, looks at Lux value, then turns on the lights ‘instantly’ if the room is dark enough, etc.
I have been playing with various PIR sensors (off the shelf 433 RF units from Amazon) and with a NodeMcu, with HC-SR50, with varying results (not activating quickly enough for me), and this method requires mains power.
I would prefer (as I already have a Sonoff Bridge with Tasmota) to build something 433 RF based and run on batteries. So the PIR would need to be instantly activated, which the temperature and Lux sensors could sleep most of the time and just update once every few mins.
Any advice or pointers would be greatly appreciated.

Kind regards.

Hi there,
Not really meeting all the points, but a good start was for me the video by Bruh (https://youtu.be/jpjfVc-9IrQ). Very fair point there on the PIR issues that I also had with esp8266.
The Sonoff RF Bridge is great to start with and you can easily add extra sensors as there are additional IO pins availables (Tasmota is a great FW to start this also).
Hope it helps, good luck.