process in a single reel 120 tank, agitate every 15s, 2 agitations, then hold upside down, next agitation cycle, 2 agitations, hold right way up etc.
This is the method I used for about 2 months many years ago, and it ruined every single roll I did that way. Some parts of the film will be covered in chemistry longer than others and the negs will show this. Unless I misread your posting, I would highly recommend against it.
Trying to be the best of whatever I am, even if what I am is no good.