New IKEA Matter over Thread bulbs can be switched to Zigbee by powercycling 12x (old.reddit.com)

So today I found out the cheapest E27 smart bulb that is 1500lm bright and >90cri is actually an Ikea Kajplats Matter over Thread bulb that costs 9.99€

And it has one trick up its sleeve:

▶ If you turn it off and on 12x times it switches to a zigbee mode so I was able to integrate it into my existing HomeAssistant setup even easier