I am not sure about "per use basis" but it is relatively easy to make Safari open a pdf through Reader. I personally have a lot of trouble doing this because some versions of Safari or Reader do not talk well to each other and it may hang on a loop trying to load a pdf) but here is the deal. Open Reader, go to preferences>Internet and tick on a box saying "display pdf in browser using" and find the Reader in the menu. Close Reader and launch Safari. It will now try to display a pdf file in the browser window through Reader. No guarantee; alas, the PC works flawlessly in this domain but not Mac. To get "per use" you could go back to the reader prefs and uncheck the box. I would also experiment with PDF Browser Plugin that can do the same but way more reliably. It is less sophisticated than Reader but maybe you would like it.
Alex 3.1 GHz 13" MacBook Pro 2015, 8 GB RAM, OS 10.11.2, Office 2011, TimeWarner Cable 2.8 GHz Xeon Mac Pro 2010, 16 GB RAM, OS 10.11.2, Office 2011, LAN
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