If Tunisia could eventually grow into something resembling an Arab version of Turkey, warts and all, it would be pure gold as a role model for regional democratization. Assisting that seems worth a few bucks.
There was probably a good reason the “Arab Spring” started in Tunisia instead of Egypt. I don’t know what that reason is, but movements seem to grow from the Sea outward, and with local investment instead of foreign influence.
Without knowing how much foreign aid Tunisia receives, perhaps movements grow easier by the people who occupy the environment, instead of by those whose will is to aid the environment.
If there is a will to grow something, perhaps starting at the roots (of the Arab Spring) is a good strategy.