> Is it possible to be asked to be called as the last handler ...

Unfortunately not, since the stack-based handlers always come after the vector handlers, and C++ handlers written using try/catch will always be stack-based.

It may be interesting for faulthandler to have a stack-based version, so that you can provide the function to call and it will call it inside an exception handler. But I don't think it's that interesting and in any case doesn't need to be in the stdlib.

I wouldn't worry about 0xE0434F4D for now, but if someone comes along with a need for it then we can add it.