OT1H, this is still relatively crude; saving output to the end is both
inelegant and suboptimal (but perhaps i repeat myself).  OTOH, it does
the job: Emacs can effect sh-like ‘1>’ and ‘2>’ control to fellow and
parent processes, finally.

Anyway, w/ that patch applied, the following program, slightly modified
From the original, works fine (look ma, no /bin/sh!) w/ invocations:

$ /tmp/info cat        # interactive, "(coreutils) cat invocation"
$ /tmp/info emacs      # interactive, "(emacs) Top"
$ /tmp/info zow        # noninteractive, exit 1, msg on stderr

To play, save to /tmp/info, chmod +x, and frob "bloody-emacs" to taste.