I don't think you can change the spell slot progression directly - this might be a request you need to make to LW and see what their reply is (the devs don't visit the forums regularly). The progressions are locked to fullcaster (ex: wizard), halfcaster (ex:ranger) and 3rdcaster (ex: arcane trickster) or picking the warlock method and I've not seen where you can copy or look at those helpers directly.
Gimping a wizard though, that's just low
