You don`t need to associate PDFs with any reader,just install all of them(FoxitReader,ClearVue PDF and Acrobat Reader).
Open your PDFs from the program,but not from File Explorer.
Now you need File Dialog Changer - v1.65,the program replaces the "Save As..." & "Open..." dialog box in applications and provides a decidely more complete interface with more ergonomic navigation.It`s free.
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1. Copy filedlgchg.cpl & GsGetFile.dll into windows folder
2. Goto Settings, click icon "File Dialog Changer"
3. **CHECK checkbox "Exchange Standard File Dialog"**
Now with your program you can open your PDFs wherever they are.So you can choose which program to open them.