This was the aim of Thoreau, Gandhi and of course the Buddha - to live life directly without any mediation between oneself and reality. And to greater or lesser degrees they all achieved that.
All these viewpoints, Situationism, Marxism etc. can be dogma or just little clues to help us live a more fulfilling and satisfying life.
Interestingly, Debord seemed to have proposed a life style of Derive, aimless wandering, following one's desires. To me, this resembles the mind set that he tries to attack. Both tell individuals "You are a snowflake! Follow your inner desires!"
Maybe the more during counter life style against the fads and suppressions of the spectacle society, is a devotion to objectivity and naked facts.
I think the issue is not about "what lifestyle", thinking is lifestyle terms seems to be a byproduct of living in the spectacle society itself! To me this stuff is first and foremost about truth in life, true freedom, but of course this path is arduous, there are uncountable layers of overly-simplified semi-truths over us.
The most radical lifestyle I believe is one in which we choose to actually live, that is to make our own decisions based on an unmediated direct relationship with our own life. Not to follow other people's direction (especially me) but instead to investigate and to try to understand to the best of our abilities how best to lead our life.
It's no co-incidence that both Thoreau and Gandhi referred to the way they lived their life as experiments. Not beholden to some mediated truth but intent on direct living and experiencing reality for themselves.