Limitations on skills

[FenrisLoki]

I am struggling to find exactly how to recreate a limitation for a character I have.

I want to have the character have Stealth, but only usable in a woodland setting. Specialization makes her better in woodlands and lowers the skill in non settings, but that isn't the effect I'm going for. Same with making a technique. I want it that she'd be rolling at default, as if she didn't have the skill at all, if she's not in the woods.

I saw Dr. Kromm's article in the Alternate GURPS article for turning skills into Advantages, but this seems to make such a skill extremely expensive. It just doesn't then feel like a limited skill use to me. It is almost an Accessibility limitation, but those aren't applied to skills.

Any ideas?