I know it’s complexity, but I wish there was an option to enable multiclass for lower difficulties.

I’m an old gamer and I enjoy just playing on the lowest settings and just actually enjoying things as they happen, and if I do multiple playthrough I would like to have multiclass as an option to explore some truly wacky builds.

Is there a work around like starting the campaign in the hardest difficulty then changing it? Or maybe just switching to the hard difficulty when you want to level up?