- safe remotely (via tramp node)
- be used via ssh in an xterm/putty ( -nw )
and it has a decent vim emulation (evil mode)
See [EMACS] "Emacs as Perl IDE" - Abstract for YAPC::EU 2016 (slides, video , discussion)
I don't know much about modern emacs binaries for AIX usable without root rights. (Though your remarks about ancient Perl there is irritating me)
Concerning IDEs YMMV, as usual. :)
PS I did the same talk for London Perl Workshop, but I have problems locating the video.