I have to say, I don’t believe there’s any benefit from switching from oral to topical unless its due to side effects.
Sounds like you’re experiencing mild sides. I doubt you’d experience any sides on the topical version. You could try topical dutasteride for a month.
The benefit I see is that topical dutasteride is 2% which is equivalent to 2mg. That’s a high dose, so it would be a lot more than your current .5mg. I’m still unsure whether it would be more effective, but you probably wouldn’t experience any sides.
My morning wood, libido is all good using it 3-4x a week. I got very bad sides from the oral version.