RD500 had a WW who cleaned the house, came and went as she chose.
It is my view that whilst friendship and connection is good, drifting in and out of your space is not. I guess you don't do that in hers. Eventually this strategy seems to irritate teenagers, I often read, you want to be my mum? Then be a proper mum to me and a W to dad. They back off usually emotionally. That is what I perceive. They have their dad and their home, a mum who is not fully involved is a by line. There isn't much you can do, this is mums decision.
I personally would like to see you start LRT, that means privacy and boundaries with your space.
The lighthouse and picnic strategy is a really great one, although the lighthouse isn't open all hours! And the picnic is available at meal times only.
You are a great organised dad, you have to be. Each parent has their own personal style of parenting. Feeding and cleaning being acts of service. So I would stop on the weekly meetings or set up online.
You are doing great
V
Freedom is just another word for nothing left to loose. V 64, WAW