Spoon

Yup - you can get an endless chain onto the bike but to do it you need to drop the swing arm. Not too difficult if you have the correct tools, special socket for the swingarm pivot bolt locknut, and a stand that doesn't use the swing arm to support the bike. Its also a good chance to grease up the swing arm pivot bearings as if this hasn't been done for a while they will likely be lacking grease.

Otherwise break the chain, install it, and use a spring clip to ride to your local tyre place/mechanic to get the chain rivetted properly (or do it yourself - personally this is one job I like to get done by a professional though).