Changing Linked broker transmit account

I need your kind help in the following matter.
Right now I use a certain linked broker account to manage my trade leader strategy.
For certain reasons, I need to change the linked broker account.
The new account (same Broker - IB but with a different account number) will have the same positions.
The strategy remains the same… only internal change which is not relevant to the investors…
I afraid that once I’ll delink the previous account, immediate Market sale orders will be broadcasted to my subscribers… and the same positions will be bought at “Market order”… once the updated account will be linked…
What will be the right way to such an administrative change without causing such a mess?
Many thanks