In my experience you can't use more than 3 bluetooth devices at the same time. Currently I have a headset, a mouse and a keyboard. To add anything else I would

In my experience you can't use more than 3 bluetooth devices at the same time. Currently I have a headset, a mouse and a keyboard. To add anything else I would have to remove something else. Last year I've built a simple 3-key macro pad using an esp32 connected via bluetooth. When I tried to use 4 devices at the same time I had a pretty bed time. I don't know this for sure, but I suspect if you have someone else sitting by you side and also using 3 devices I think the interference could cause some strange behaviour.