Yeah, but i couldn't split in multiple parcels, this is an common pratice here in Brazil (we call it "parcelamento", i don't know if this is a custom elsewere), this would bring more Brazilians into the game.
Instead Steam you could add an payment option using "pagseguro", or putting your game on "nuuvem" so it would be easyer to Brazilians pay and play and know the existence of this game.