Dak & Hopkins for Wentz & Murray?

So this is a full PPR format with a twist. The roster is WR heavy with 3 spots and I have two WR on bye in week 8. My RB depth is medocre but with the WR heavy roster its making me think I can get away with this. Below is my Roster and yes with the number of bench spots and a 12 team league its super deep at this point and the reason why I started grabbing hand-cuffs early.

QB: Wentz, Cousins
WR: Keenan Allen, Fitz, Cobb, Funchess, Travis Benjamin
RB: Freeman, Murray, Abdullah, Collins, Conner, Tolbert, McFadden, Ellington, Aaron Jones
TE: Rudolf

With Murray, Fitz and Cobb on BYE in the 8th week I am thinking if I can move Wentz/Murray for Dak and Hopkins I get one less guy on BYE in week 8 and Hopkins in a PPR format has a very safe floor.

Thoughts? Would you do this? Would you rather have Wentz or Cousins rest of season? There are very few streaming QB’s in this league because of the number of bench spots and teams.