this is how we go about applying the filer to calls, inspired by the proxy pallet methods and functionality. and here we can parse out names from runtime calls that are valid members of the enum, checking statically for build time of the node and subxt-like type checked ways to build extrinsics. Plus at runtime we check the extrinsic data as well.
Not sure what you mean here 
this event is the same using that helper fn from before to extract names… am I missing something?