You cannot skip the product key step and go straight to a 42-digit code. The confirmation code is unique to your hardware and product key.
The short answer is that it is not recommended to look for a free 42-digit confirmation code for Microsoft Office 2007. Microsoft Office 2007 is a paid software product, and using it without a valid license or activation code is against the terms of use. Microsoft Office 2007 42 Digit Confirmation Code Free
Because Office 2007 is no longer supported, phone activation services may be unavailable or fail for many users. Microsoft Learn Risks of "Free" Codes Online You cannot skip the product key step and
Websites claiming to generate or provide free confirmation codes are typically: Microsoft Office 2007 42 Digit Confirmation Code Free