Does the ability for a process to name its own debugger help any here?
It wouldn't do for all applications, but perhaps the standard toolkits
could be patched to support it.  From the wiki page:

  In the case of automatic crash handlers, a crashing process can specficially
  allow an existing crash handler process to attach on a process-by-process
  basis using prctl(PR_SET_PTRACER, debugger_pid, 0, 0, 0).

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https://bugs.launchpad.net/bugs/1006398

Title:
  Bypassing ptrace restrictions for errors from hanging applications

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