As long as the end of the pin is burred over again so that the side plate doesn`t come off,
then this should be fine. Many chains do not come with a side plate and clip, and rather are
sold as continuous when new and i know from when i worked in motorcycle stores
many customers have broken the chain (with chain breaker tool which forces pin through) and re-connected, then burred the end. Rather than unbolt footrests or swingarm or whatever is required for that bike. Joining like this is never recommended, but i`m sure 3rd world countries do it all the time too. So don`t stress about it, providing the rest of the chain is actually ok!

You said in the other post that it is 3,000 miles old. Does that mean you bought it in Sth America? If so, read the side of it to see the manufacturer and model. Asking for an F650 link may only help if you bought it from a BMW dealer and they only use chains from their BMW distributor, or they order the exact same chain from an after market supplier.
You should have to pay about US$1-130 for a suitable o-ring chain for your bike. There are a lot of 450cc 4 stroke dirt bike guys that race/ride on this continent and many of them would use such a chain. Most KTM stores, for example.

If it broke in 3000 miles then i`d suspect it was either under-rated or low quality, or
something like a rock got in between the sprocket and chain although very rare and unlikely. Happens a lot to belt drive Harleys ridden off road though as the belt has (should) little freeplay, if you needed to know that!

The normal measure of worn is if you lift the chain off the rear sprocket and see more than half a tooth, and if so then the thing is just crap, 3,000 miles or not.

If it is very worn then don`t keep adjusting it as it will only continue to stretch to how
it wants to be, and eventually break. Leave it say 30% worse then recommended adjustment if you want to ride to wherever your next chain and sprockets are, and don`t go nuts when off road or it will jump off the sprockets!

We all know you like an adventure Geoff, so give it a go... :-)