From what I've read on it, you want to frost seed when the ground is "honeycombing" or when it freezes at night and thaws in the day and in the process the moisture in the soil contracts and expands moving the soil with it. The small seed falls in these cracks and then it is planted.
Sandy soil does not do this so therefore its a no go on the frost seeding.
You are very lucky to have all the equipment, the smaller stuff is hard to come by and they sure don't give them away anymore.
Let us know how the frost seeding goes.
Genesis 27:3 Take your bow and quiver full of arrows out into the open country, and hunt some wild game.....