I thought AFT was an attempt to engage readers not Subject Matter Experts.
In my experience two of our most effective ways to outreach to those experts who are not already in the community are the GLAM program and potentially the education program.
This was one of the areas that Johnbod explored in his time as Wikimedians in Residence at Cancer Research UK. You might want to talk to him as to how that went and the extent to which it could be replicated. The focus of a lot of residents has been more on getting openly licensed digital material, but I don't see why we couldn't have more residencies focussed on expert review, providing of course that the articles in that area are already at a stage worthy of review.