would love to see the process documented/pictured, if possible chap
If I don't go down the custom trunnion route I will do. Looks like the threaded, sticky outy bits on the standard RS trunnion are removable on the Jekyll version (and aren't internally threaded, so its not possible to bolt straight on). They are also wider in diameter so won't fit inside the travel chips. I can now understand why using a brake boss as a mod has been suggested as these could be trimmed down and screwed in to the fox trunnion, and would then accept a bolt to attach it to the travel chips/linkage.
Not sure yet if this will be as simple in practice as it sounds in theory, or if the travel chips will need drilling, but only time will tell.
Surely someone has done this already and knows the process and pitfalls?