To answer my own original question, Attila on eBay sells adapters for M43 and Sony NEX: http://bit.ly/NcVI41
Built from a discarded Kiev body, and provided with a "free" Jupiter 8 lens (which was presumably on the donor camera).
My order was despatched through Hungarian post who managed to lose it (tracking did not get beyond initial processing). Attila immediately arranged a replacement which arrived safely today; good service and the adapter seems to work very well.
Now I can go and test out my little collection of lenses (four so far) on my M43 and decide which is best for using with my Kievs. Plus they look very cool stuck on a GX1.