Trying to open a new account with a new email address sounds like a good idea.

Checking in expecting to use your wife's Honors membership when she is not checking in as well is a violation of Honors' terms and conditions. Hilton agents are taught on day one that the "Honor member's head needs to be on the bed".

That said the ideas others have given to get around this may work. Until they don't. Then a few things could happen - singly or in combination depending on who figures out and how much they care. Most likely, they will just deny you the benefits. They could cancel your reservation if your wife is the primary name on it and doesn't arrive. Or they could close her Honors account and take any points in it. She could plead that she is innocent and probably get a new account opened and her points restored. But Hilton's Fraud Prevention team would monitor the new account and, if there were another T&C operation would close the account, take the points and blacklist her (and possibly you) from Honors.