I've read accounts that the showrunners wanted the fourth Doctor to be older and less a "amn of action" like Pertwee which is why the character of Harry Sullivan was introduced. The idea was to partially return to the show's earlier dynamic with the Doctor primarily as a "thinker" with Harry and Sarah handling the action aspects. In fact Bernard Cribbins was one of the actors considered, though at the time, he wasn't really that old and would have been in make-up like Hartnell.
But as we know, Baker caught their eye and those original plans were partially tossed. Harry was still introduced and stayed the 12th series as originally planned.
So, yeah, the producers were thinking about going for something purposely the opposite of Pertwee.