Perhaps our European regulars can be more helpful.
In terms of
virtual or
online collaborations there are no geographical limitations. If a songwriter wants to add vocals to a recording it doesn't matter if the singer is on the other side of the world. Each records his or her part locally, exchanges via the internet, and someone plays the part of engineer to handle the mixing/mastering.
That is partly what this forum is here for. Unfortunately there haven't been as many projects done here since the forums were restructured and the drummer forum was archived. Still, if you'd like to participate in an online collaboration feel free to post your idea here. If you aren't successful here there are other sites with more active online collaboration communities.
As an aside, I can't say I've run across a vibraphonist yet online. For recording purposes it would probably be easier to find a keyboardist that has a good vibraphone sample in his or her sample library.
Hope you find what you're looking for!
