Doesn't the Crosstrek fill this role?
Also, Subaru STI has already been using the 2.0 DIT engine for the WRX STI in Japan. See the WRX STI S208: https://www.caranddriver.com/news/wing-swap-jdm-subaru-wrx-s...
A hatchback WRX is an Impreza with an entertainingly powerful engine.