I am working on a project for a physician who only cares about reaching patients within a specific geographic region. He has a new technique at his practice and wants to get the word out via radio spots. I want to track the effectiveness of the radio campaigns without the use of call-tracking numbers or special promo codes.

Since the physician's primary domain is very long (but well-established), my thought is to register 3-4 short domains referencing the technique and location so they would be easy for listeners to remember and type-in later. 301 these domains to the relevant landing page on the main domain.
As an alternative. Each domain could be a single relevant landing page with a link to the relevant procedure on the main site.

It's not as if there is anything deceptive going on, rather, I would simply be using a domain in place of a call tracking number. I think I should be able to view the type-in traffic in Analytics, but would Google have an issue with this?

Thoughts and suggestions appreciated!