I ran those links and from the picture it looks like it just a simple hose stuck on a barb....or not stuck in your case.

1.What if you just opened a small neat cut in the head liner to see/feel/hook the hose back up? Then neatly sew up the cut. I know that ain't a great option, but the part about "glued around the edges"...that scared the snot outta me! I would rather have a smal neat cut as opposed to tattered edges everywhere.

2. Looking at my sunroof, manual, I can see the front drain holes. #2 is even crazier....what if you just plugged the suspect drain and hope the other three can handle the water load. It might work. If it still leaks, well, it was leaking before. Might be worth a try, use Silly Putty or similar so you can easily undo what you did! If it works, great! If it doesn't work, there is still the headliner to tear up.

Now, if you do a total trash out on the headliner.....how does a shag carpet roof sound to you?? Worked for me on a '69 Ford hippy van!

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Mark
1983 300TD Wagon
Even a broken watch is right twice a day