I know little about astrophotography, but I do have a HoTech laser collimator, purchased mainly because of the clever way of mounting in the focusser - their so-called SCA ("Self-Centering Adapter").
The HoTech have developed a T-adapter based on that technology:-
http://www.hotechusa.com/SCA%20T-Adapter.html
What do you imaging folks make of that?