Find a simple solution with macro only as follows:

r,RET,
;Place original filename in history (in case something happen)

r,QUOTE,SPACE,QUOTE,#,QUOTE,RET,Y,
;Replace all space with #

r,QUOTE,#-#,QUOTE,SPACE,QUOTE,RET,Y,
;Replace the dash with space. Now the two segments Title and Author are unambigiously defined

r,CTRL_LEFT,CTRL_LEFT,CTRL_SH_RIGHT,SH_LEFT,CTRL_X,BKSP,HOME,CTRL_V,SPACE,-,SPACE,RET,
;Cut-Paste second half in first half

r,QUOTE,#,QUOTE,SPACE,QUOTE,RET,Y,r,
;Restore space

HOME,CTRL_SH_RIGHT,TAB,LEFT,COMMA,RET,
;Capitalize Name and put comma


I still have to do some handling by hand because files are not named consistently accross the collection (sometime "first last", some other time "last first", or having with two authors, etc.). But I have variant of the macro to handle these.