You can already do this with the floorplan-card or with the picture-elements-card. like this your sensors etc. will be objects with their own icon etc. and you can change the floorplan however you like.
I don’t know about you, but I never change the position of my devices after I installed them and certainly not into a different room, so you set this up once and then only again when you move house and then you would also need to change the geocoded location for all devices with your approach.
I don’t think this is possible, for this the wifi sensor doesn’t update often enough and also the distance you get (if you are able to get it) from the bluetooth and wifi sensor will not be accurate enough for a scenario like this. But why not just put a PIR in the living room and when this PIR is triggered you entered the living room?
You can do presence detection on room level with room-assistant (I do this myself and posted a guide here in case you are interested).
Can you please describe this cae in detail? Probably there’s an easier solution that doesn’t require geocoded location 