Pointed > Name Servers

I am bringing a new server online which has different name servers then my old server. I wish to do the following if possible.

I will transfer accounts from old server to new server via WHM copy account method. Then I will notify clients they need to change their name servers . Ok that is the easy part no problem there. Here is what I want to accomplish if possible.

On the old server somehow point those accounts to the new nameservers on the new server until the clients get their dns changed, Is this possible.
I was thinking maybe adding a "A Entry" on the old server somehow.
But not sure how to accomplish this.

Has anyone done this before if so can you walk me through the steps required?

 

 

 

 

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