I think KMs are probably the place to look first, and maybe the WT. Yearbooks will be good for direct examples of people preying on the weak. You might also try search terms such as "right-hearted" (not sure of the hyphen) or "heart condition" as well as references to "When someone you love dies" as the mention of that brochure is probably always going to be in an experience that indirectly encourages the R/F to prey on the emotionally weak.
From a quick search on the online library so far I was able to find:
http://wol.jw.org/en/wol/d/r1/lp-e/102006014 - This was on the back cover of the Awake, clearly meant to appeal to a HH who recently lost someone in death. It looks like the brochure is featured roughly once a year on the back of the awake.
Yearbook experience of a student giving the propaganda to their teacher after a death: http://wol.jw.org/en/wol/d/r1/lp-e/302013013?q=%22When+someone+you+love+dies%22&p=par
Another nearly identical experience in a yearbook: http://wol.jw.org/en/wol/d/r1/lp-e/302009010?q=%22When+someone+you+love+dies%22&p=par
Sample presentations designed to regress a HH emotionally to a time when they lost a loved one (these will also work exceptionally well on someone who's very recently experienced such a loss):
http://wol.jw.org/en/wol/d/r1/lp-e/202013330
http://wol.jw.org/en/wol/d/r1/lp-e/202011089
An announcment about the "special" public talk after the memorial, which is the most attended regular sunday meeting of the year, and all are encouraged to bring interested ones and UBMs. The title of the talk was "does death end it all?" http://wol.jw.org/en/wol/d/r1/lp-e/202013049
And I saved the best for last. Paragraph 5 will be of interest to you, where they are encouraged to reach out to UBMs when they are in the hospital or have recently lost someone: http://wol.jw.org/en/wol/d/r1/lp-e/202010406