I am of the opinion that making something yourself if almost always superior to buying something frozen and serving it.
That being said, french fries are one of the few exceptions. Yes, if you cut, soak, blanch, cool and re-fry your house made fries perfectly, then they will be better than frozen fries. However, I would much, much rather have a good, solid, crispy frozen fry than a soggy, limp, bad house made fry.
There are very few places that get the fresh fries right. They are seldom crispy, often overcooked, and just generally inconsistent.
I would stick with your frozen fries, unless you are 100% sure you will turn out a better product, which I think is unlikely given your limitations in space, time, and staff.
Remember, you also have to peel, cut, soak, and store the fries. That can take up valuable walk in space, especially in a small kitchen.
Again, normally I would not recommend using a frozen, pre made product, but fries are one of the few exceptions. Assuming you get good frozen fries, which there is a range of quality.