Sure, it's not optimal but it can work. I assume you mean Bermuda or st. Aug?

Centipede is all we have local

Seed and sod need the same amount of water to become established. The sod has to root into something moist. Otherwise yes, centipede will spread to fill. Where do you live that you can't get bermuda or St Augustine?

South Georgia, Bermuda won't do good with the shade I have and The only place to get St. Augustine is four hrs away

Can you spread individual pieces of sod out to extend the sqft out of a pallet?

Yes, but you have to fill in between the pieces with topsoil to level it or you end up with a waffle lawn.