Orange oil is an alternative to the "toxic gick" that we shun here on Permies. Read up on it* so you can find a local termite company and talk intelligently with them about it. Many commercial companies offer orange oil for spot treatments, which sounds like all you need. Of course, termite companies make more money when they tent the whole house and apply much, much more toxic chemicals, but if you stand your ground that you want to try an orange oil treatment first, you can have your safe alternative.
*You can start with
this link.