I have sent test fonts privately to Josh Hadley at Adobe.
1. Install the three fonts
2. In PS, make a text box with the text "Q$" in all three fonts
3. For Mokoko, select Weight=900, for Mendl, Weight=900 and for Aktiv Grotesk, Weight=900 and Width=75.
4. In Aktiv Grotesk and Mokoko, the dollar with a continuous stroke should be replaced by a dollar with a stroke just at the top and bottom. In Mendl, the Q should be replaced by a Q with a stroke just on the outside.
PS does however not replace anything. Mokoko and Mendl use the rvrn feature, Aktiv Grotesk the rclt feature to specify conditional substitutions.