There's no way to alter the default paste. You can RIGHT click and get options instead.
Beware though the default was changed for a very good reason. It was possible to recover ALL data (not just the chart data) from the non linked excel. This could be embarressing ask Sarah Palin!
You might want to try pasting as an image. It is possible to do this from the keyboard
CTRL ALT V
Release these!
Down arrow
ENTER
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