Managing identities without suspending Mutt

[Gregory Heytings]

Hi list,

Is there a trick to execute a macro after a shell-escape which asks for 
user input?  I currently have:

macro index A '<shell-escape>shell-script '
macro index B '<enter-command>source ~/.mutt/mutt-script<return>'

shell-script writes mutt-script, and I'd like to do 'B' when 'A' returns, 
without having to press 'B'.

A few words about the context of this question: I'm trying to find a way 
to manage multiple profiles/identities without "leaving" Mutt.  I tried 
the muttprofile Perl script, which works fine, except that Mutt is 
suspended while it is executed.  The above question is however not limited 
to that use case.

Gregory