You could always try P/T initially and then decide if it is putting constraints on you before you go full ER.
+1
When retired from career job (15 years ago), did some consulting but when the time/travel interfered with other activities, I gave it up, even though money was good. For the past 8 years I've been a seasonal employee, only work Jan to April, (I refer to it as my Dog Days of Winter job). I generally decide my own hours and do not have to put up with the corporate BS. Come in, do job, follow guidelines, but don't get into any company self-promotions, latest HR program of the month. Haven't even had a personnel evaluation yet.....in 8 years. Guess they are happy, and I'm happy.