Sounds fine with me, you`d have to make sure you increased the tax mod by just barely the enough percentage to cover typical avg food costs... Which means you`d either make guardians overpowered due to low foods if calculated incorrectly, or you`d make them even more broke.
Another idea along the guardian idea would be to increase the CG mod on them to be equal to housing, since CG`s never go higher than 4.