I can really relate to your sitch. Like you, my H isn't being honest and like you I am hyper aware of details such as what time he gets home and what he's doing.
From reading your posts, I sense that you might make more progress long-term by emphasising detachment and GAL as opposed to initiating contact with him and being loving. Your plans for the Y and zipwire etc sound great. You want him to see that you're having a great life and that you're not too fussed about whether he's part of it or not. It sounds as if you're doing a lot of the work in terms of taking an interest in your H and being warm. Do you find that you initiate many of the convos?
I can understand you wanting to show him that you care but it may feel to your H as if you're overly focused on him and pursuing him.
As I said, I can relate to your sitch. I also have a child with special needs. It's helpful for me to read your posts and I look forward to following your progress.
Me: 51 H: 52 T: 23 yrs M: 19 yrs S18, D16, S14 (special needs) PA: 2003/2004 Piecing: 2004 on Suspect H had EA: 8/2012-12/2012