Nostalrius Begins - Quality wow vanilla realm (1.12)

What I am looking for is an addon that will allow me to switch 3 bars each time I switch stances.

For example:

Battle stance
bar 1
bar 2
bar 3

Defensive stance
bar 4
bar 5
bar 6

Beserker stance
bar 7
bar 8
bar 9

Anyone know of a way to do this? I know that I could do it with bartender 4, but I cannot get bongos or Bartender to use more than one bar for stance changes.

Any help would be appreciated.

Thanks.