I am not going to say that I don't believe you, (I've pretty much given up hope for an uncut version to happen myself.) but I will say that your "evidence" isn't really all that sound.
First off, the fact that it comes from Wikipedia, a site ANYONE can edit. I do understand that the mods there have started taking their job more seriously then back when it was first made, but things can still slip through. A lie still pops up there every now and then, and sadly, I do recall "The Land Before Time" being abused of lies for some time. (The infamous "Growing Sky Stone" rumor, anyone?) So yeah, with Wikipedia, I really don't trust it all that much.
Second, why would they choose to do an uncut version in Finnish or German, but not other languages? If it did exist, did it not do well or something? They could've at least done a special in every language. It would be the reasonable thing to do in the end. Really, I don't believe the one-time airing deal. It just doesn't add up.
Finally, there is a piece of evidence that makes it sway towards it never happening. Something only a number of us members know. Basically, Don Bluth did a podcast once where he answered some questions about his career. One of the mods here went to the length of asking what happened to the scenes that were cut out. Don Bluth commented that the last one to have the footage for it was Steven Spielberg. No one's sure what Spielberg did with them. On the off-chance they are in a vault, we await the day they are released to the world. Still, there's no telling what happened to those scenes at all.
Add on the fact others have stated that they haven't found anything, it just really doesn't add up.
A part of me does want to believe you, but there's just too much evidence here. I'm sorry.