Hard to say. First time I actually heard of someone using Betamethasone for SD, but it’s a steroid cream, so that makes sense…
Overall it seems that steroids have caused more difficulty long term for most people.
What I would do is start the honey treatment and see if things improve enough so that Betamethasone can be discontinued.
If the honey doesn’t do much, consider checking out my Overview of Seborrheic Dermatitis Face Treatments post. It covers most things I attempted and lot’s of good info in the comments there as well.
Do you notice any correlation of your symptoms to food intake?
Best of luck and hope that helps.