The way I mentioned (and I do realize it calls for a redesign which is
probably not practical now) is that ALL lines after the MEMBERS keyword
would be userids and not keywords.  When a list is read in, its starts
reading in keyword mode.  For each keyword, its sets some data.  When
the MEMBERS keyword is found, it switches to members mode, and each line
till the end of file is a userid, unless it begins with a "*" in which
case it is ignored.  The "*" lines should properly be discarded at a lower
level of list reading where it is unconcerned about the mode.  Sorting
the list is not hard in XEDIT, just go to top, find MEMBERS, down 1, and
sort from there to end.
 
'COMMAND LOCATE -* FIND MEMBERS'
'COMMAND LOCATE +1 MACRO SORT * A' col1 col2