I enjoy seeing an exchange of ideas here on the blog. I invite you to list attachment based interventions that you use. Here's one to get us started:
Constancy of Contact. Find one time each week that the couple will get together without discussing relationship problems. This can be a walk, a coffee date or doing a shared activity. The time and place are agreed to ahead of time and neither partner needs to request it. This is designed to build reliability, accountability and time together without stress.