I agree with Jan on both options. No way I would make a scarf lopsided.
But there would be a designy option: step up 0.5 mm now, then another foot down the road (mark the spot of the first change), you do the same step again: step up jet another 0.5mm and so on. Then the scarf will flare on one end and be more narrow on the other. If you like that look: great.
Well, I guess, I would either finish the scarf as is or rip out. Careful: uneven yarns often do not rip very well.
Continental Knitter with passion, pretty busy and always onto something new.
I have been away from the forum for a bit, but I am still around!