While not a tax answer, if:
steve234 wrote: my income can be taken into account in the eyes of the lender
While not a tax answer, if:
is all that you are looking to achieve then I don't see why you would need to co-own the property. You could be a joint borrower, or a guarantor with your wife as sole borrower, and your wife as the sole legal owner of the property could grant the bank a legal mortgage over the property. I don't see why a bank would take issue with this, they would effectively have you on the hook with regards to repayments and they would still have a legal mortgage over the property as security.
Simples.