Is it possible to bulk change timeslots?

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Hi!  We have a 2 hour service window timeslot defined.  Now we want to change to a 3 hour window.  When we make the cutover from 2 to 3 hour timeslots we will have to manually change the timelsots one by one and then pass all of the appointments from the old timeslot to the new timeslot.  (eg 8-10 appointments will be absorbed into 9-12; as will 10-12 and 9-11). 

Making these changes manually is a tedious process.  What we would want to do is take a group of 08-10 timelot appointments and move the group to the new timeslot.  (Bulk move rather than one by one).  This isn’t possible since the time_slot option was removed in a recent version.