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Not really possible, and It would not make a difference for your registration here.
 
Gamersgate is a seperate company.
 
You want to keep the digital version but have it registered with the CD key.

So, isn't your question then:

Can you give/trade away the CD and let that person register the game with the digital key?
 
And the answer should be "yes". Your key is just for the forum, unless SR has anything special going on, so if you sell/gift your CD version just give whoever it is a note of your unused key and they can register with that.