Yeah they really nailed the lid shut on the thaumaturge doing 2H weapons and shields. At least while getting full mileage from their class abilities.
On the other hand; Implement's Empowerment makes a 1H weapon do the amount of damage you can normally get from a 2H weapon. So all this limitation is justified.
I think the happiest thing to do is use the thaumaturge to go wild with all those 1H weapons that you thought were cool but had poor damage.
considered a thaumaturge with throwing shield build
not actually that strong but would look fun
My character in PFS has been making good use of a whip and its reach. 1d4 + str bonus + 2 for implement's empowerment x 2 for a striking rune and adding mortal empowerment or personal antithesis damage makes for some decent numbers.