Also the other issue: the first thing the American company does is ensure it sells coffee-makers for $149 and not a penny less.

In fact depending on your tarriff regime, this can incentivize a bunch industries to actually raise prices if the new import cost is higher then they would currently sell at.

The incentive to raise prices is pressured down by customers' desire to not spend more money than they have to. If businesses can get away with raising prices that means the price was too low to begin with, tariffs or no tariffs.