Yeah, but F2P players can only get a structure deck once. And we know already that the best card/s in each one only contains a single copy of them.
Neos Fusion and Geartown are top tier decks, but require 3 copies of them to actually work in a competitive level. And that requires to cough up the dough.
In that case, I think you’re out of luck for the time being- but with Tyrant Wings being the first structure deck exclusive Rare card being reprinted into a main box, it’s possible to hope that Cosmo Brain might get put into a normal box set later down the line