Not really.  By changing the end time you cause Outlook to regenerate the
entire series, wiping out all exception information, including notes.

Instead, create a new calendar folder, copy the recurring event to the new
calendar, then export that calendar to a CSV file.  Outlook will ask you for
a range of dates for the export.  Specify the starting date and the new
ending date.  This will convert the recurring event (which is only a single
entry in the calendar) to multiple, nonrecurring entries, each of wehich
contains your exceptions and notes.  Then, go back to the original calendar
and remove the original recurring event and import the CSV.  That will
re-add all the individual events representing the recurrences, complete with
exceptions and notes.  You can then add a new recurring appointment that
starts where the old one ends.  Once it all looks good to you , you can
delete the new calendar folder you created and that contains a copy of the
original recurring item.