The conventional method of using the Copy-Paste function is through a mouse or through the keyboard-hotkey combinations. Both of these methods are not ergonomic as they involve the use of our hands and forearms in an "un-natural" way which causes Carpal tunnel syndrome in the long run.
Since the Copy-Paste function is one of the most used commands in computer-related work, it needs a special "Dedicated Copy-Paste Hardware Button" which would make the execution of this command much easier and simpler.
Here is a practical "Dedicated Copy-Paste Hardware Button" concept that can be applied:
Reference -
http://gadgets-stars.blogspot.com/2011/03/copy-paste-with-grace-and-haste.html