Interesting question - land travel between Asia and Europe. It doesn't seem to be prohibited directly by the rules. They only disallow transoceanic surface segments. Of course, you are really not travelling between IATA Area 3 and 2 on a OWE ticket which might be a problem. Might be worth talking to your favorite airline's RTW desk about this.

As for buying the ticket and then not using it, that won't work. The rest of your itinerary would be cancelled based on your no show for the Asia-Europe segment.