Change log after signature | feature development idea

Hello, 

I'm aware that pdfs cannot be edited after a digital signature has been added. However, it would be very beneficial to me if changes *could* be made to the pdf after signing, and such information was available in a change log. For instance, it's not very efficient to re-route a form for signatures after corrrecting some typos. It'd be great to have the capability to fix the typos, but then let readers know what exactly has changed between the version they are seeing and the verision that was signed. 

If anyone knows a work-around, I'd be very interested!