I know I'm not ready for the weighted lunges in F3 and F4 yet, but I was curious: would it be fine to use the front rack position instead of the back rack position? This would be easier to achieve with a power clean. Rather than finding a way to put 170 pounds on my back without a squat rack.
An option would be to buy a power rack and just walk it out, but I'm not sure if I want to buy a power rack... at least for a few more years.