To make the Berner Oberland Pass worthwhile, you should adjust your days somewhat to get the most out of the pass. With your current plan you're not doing enough included activities to justify the pass. This is assuming your trip is between late June-late September for availability of these locations....
1 - Wengen village exploration
2 - Wengen > MORNING Mannlichen + walk to Kleine Scheidegg > train to Grindelwald > AFTERNOON Grindelwald First > return to Wengen via Zweilutchinen/Lauterbrunnen
3 - Wengen > Lauterbrunnen > Stechelberg > Murren > Schilthorn > Birg Thrill Walk > Murren > walk down to Gimmelwald > Stechelberg > Lauterbrunnen > Wengen
4 - Wengen > Interlaken > Brienz > Brienzer Rothorn (seat reservation required) > Brienz > boat ride to Interlaken (optional stop at Giessbach) > Lauterbrunnen > Wengen
5 - Wengen > Paris
With this, get the 4 day reduced BO Pass + Half Fare Card and get a reduced Saver Day Pass for Days 1 & 5 to cover your trip from the airport to Wengen and from Wengen to Basel on the way to Paris. The Saver Day Pass has to be purchased far enough in advance to get the discount, so if you don't do that, then just purchase half fare tickets from Zurich Flughafen to Wengen and from Wengen to Paris.