Asivad Anac said:CIC explicitly allows you to upload an LOE (Letter of Explanation). This is a valid workaround in the same vein.
This.
In your situation, whether you decide to use your joint account, or transfer funds to a sole account, you'll most probably still need a declaration from your wife.
Why are you trying to complicate the issue?
You have a joint account with your wife who will be immigrating with you. Where is the problem? IMO, you may be overthinking this.