Not too positive. Building bridges will be difficult.
The most scientific page and resources on open theism and openness theology is definitely that of the Reformed theologian John Sanders.
Romans 8:33 shows that Calvinism and classical theology do not always know the right answer. Bible commentary.
The neoplatonist Church Father’s ideas were borrowed by the adherents of Reformed theology. Open theism studies a lot this historical development.
Classical theism (Catholic and Reformed theology, Calvinism included) borrowed unbiblical notions from Greek philosophy.