@Carl Love Thank you for your reply Carl, I'm sure the tone of your contribution will encourage people of all levels and abilities to participate.
The reason I posted this solution is because I was encouraged to do so by a Maple Product Manager.
He also told me that a command to change the type of DataSeries members was omited from Maple 2016 only due to time constraints, but would be included in the next version.
"In fact, we have already added a new command, which will be available for Maple 2017, that changes the datatype of the entries in a DataSeries, as well as the datatype of the DataSeries itself."
@DSkoog This is likely to address the more general case presented by Daniel Skoog below.
In the meantime people searching for an inbuilt command will find this thread.
All the best,