Interestingly to me - this really fits with an ongoing conversation MrS and I have been having (we both have an affinity for secular buddhism type concepts) and a recent lecture I attended on "Compassion Meditation Training for the Promotion of Emotional and Physiological Resilience and Well-Being" . The presenter and his research team are looking at taking lessons from Tibetan Buddhist compassion meditation and developing a secular version called Cognitive-Based Compassion Training which can be taught in 6-8 weeks. Sounds like this could be right up your alley!
If I remember correctly (my copy of the presentation slides is currently trapped in my lost luggage in some airport) the first part has to do with viewing the world as it really is - and this has a lot to do with attachment (which is what you are asking about) - the focus is on trying to decrease attachment to the people/places/things that you like, trying to stop avoiding the people/places/things that you dislike, and trying to stop ignoring the people/places/things that you are indifferent to.
The second part (obviously the first part is something that you work on continuously) has to do with practicing consciously looking at people with intense empathy and compassion - the people you like, the people you are indifferent to, and, finally, the people that you dislike.
I don't have the specifics of how the training is done - most of the links I find are about the research team and the research being done. Hopefully there is more to come!
Me: poly bi female, in an "open-but-not-looking" Vee-plus with -
MrS: hetero polyflexible male, live-in husband (23+ yrs)
Dude: hetero poly male, live-in boyfriend (4+ yrs) and MrS's best friend
Lotus: poly bi married (to TT) female, "it's complicated" relationships with Dude/JaneQ/MrS (1+ years)
+ "others" = FBs, FWBs, lover-friends, platonic G/BFs, boytoys, etc.
My poly blogs here:
The Journey of JaneQSmythe
The Notebook of JaneQSmythe