It's been a while since I last posted anything, so here's some more progress. In fact, I got the thing done, but let's not get ahead of things.
Before starting to remove the canopy masks, I expected trouble. I wasn't mistaken.
The black lining lifted off at several points, probably due to the interior color that was sprayed on first. Fortunately, the most was at straight or only slightly curved parts, so masking and touching up the black lining wasn't such a problem. A chore it was anyway.

I'm not 100% satisfied with the results, but that'll do.
After already having fixed the circular green radar decal (or whatever it is) with future, I noticed I had applied to the wrong place. In this pic, the decal is about to be painted over, with left-over masking material being used to mask around the area. Conveniently, the wheel masks' surroundings had just the right curve for the job. The correct is alread painted green in the picture as well.
And there, it's done:

I'll set up a proper backdrop and take the usual show-off shots later because the landing gear is glued on with styrene cement and is still drying.