I really like my Stein Mini Cassette Lockring Driver: weighs about the same as a cassette lockring tool, is small and flat, and you don't have to carry around a heavy crescent wrench or chain whip tool, but still does the same job as all three of those tools.

Here is a good description of the tool (older version of it, anyways): https://www.crazyguyonabike.com/doc/...page_id=325740

The fibrefix spokes look like a great gadget, and I love the idea of the dogleg spoke, which are great temporary solutions. I suppose one advantage of carrying spare spokes and a tool to replace them, though, is that the fix will hopefully be permanent and you don't have to worry about it again down the road.