Just finished working on these - And here's me thinking it would be easy!
I masked them off with tape, and painted them last night, mixing more orange into the paint per stripe.
Removed the tape today - The paint had seemed underneath
So I spent all day with a scalpel scraping the yellow away.
There's still a bit more excess yellow than I'd like, but overall I think it looks pretty good - The weathering's pretty close to what I intended anyway, and I should be able to touch up the green a little bit if it annoys me.