I've done the following BBS using a two day/week template. It works.
Choose TWO lifts to do the BBS challenge with: one "lower body" lift and one "upper body lift". For example, choose the squat and press.
Do the lower body challenge lift first in the week.
The other lifts are done with 5's PRO and NO MORE than 3x5 of FSL.
Squat - BBS Challenge
Bench - 5's PRO
Deadlift - 5's PRO
Press - BBS Challenge