Hi Dave and welcome !
Go ahead and preshape 'em !
getting your dough into the shape you are going to bake it in is prob the longest process after making the actual dough.
I preshape my dough do this all the time. So did my mother years ago, and still does.
Make your dough,
get it stretched out on your pan
get it into the freezer.
Now the day of the party, get it out and onto the counter a good 2 hours before.
This will let it thaw out and start to rise....
you can even start topping it while it is frozen if you are in a hurry.
Pop it into the oven when you are ready.
There's absolutely NO rules about not doing this, if there were, then you would never see these frozen
pizzas in stores.
Yup you are on the right track, get the dough done and then all you have to do is top the pies. That's easy and you
can do it while sipping your favourite beer.
P.S. - I have many times made my fresh dough, rolled out the dough to fit my pans.... I'll make 2 pizzas,
one I bake that night, the other ? ... I preshape it, and even dress it ! and into the freezer it goes and I use it a few days later
or the following weekend. ( that means shaping the dough on the pizza pan, adding the sauce, cheese and my toppings )
all stuff I use on a pizza freezes fine, and thaws fine. ( pepporoni, cheese, mushrooms and green pepper )
Good luck and let us know how it turned out eh !