as a fellow fuzz freak I actually prefer the modular approach:
The Studio EQ is the obvious choice for all your EQ needs and the Analog Octaver is a wonderful model of a classic analog (duh) flip flop octave down effect.
Having these processors as separate stomps enables you to chose their position, octave in front, EQ post fuzz? not a problem EQ -> fuzz -> octaver? sure thing.
This unlocks a lot of additional fuzz colors and I wouldn't want to sacrifice those.
The Kemper drive has a slim down knob maybe something like a loudness curve setting for the shin ei superfuzz type tones and on the other side midfocussed would be a easy way to implement it imo