Already done it mate
The shims were a real ******* to get back in. There were three each side and I checked them all to make sure I was only trying to put the thinnest one back in, but it was still having none of it. Without the shim it rocked a bit, so I definitely wanted to put it back in.
I'm sure that there is an art to it, but I resorted to the Brute Force [TM] method and put the breaker bar between the engine and the swingarm, then in an amazing feat of dextrousness, I managed to apply pressure whilst holding it in place AND slide the shim in AND push the pin through.