I don't think so either, Andrew. God used pharaohs too, but we wouldn't want to venerate them. Or Nebuchadnezzar, or Pontius Pilate (unless the EOTC's texts about him are true)...
True. But the language used to talk about Cyrus is different from that used to describe pharaohs, Nebuchadnezzar, or Pilate. Non of them are referred to as God's "anointed." The way he is spoken of is different than how the Old Testament refers to other kings. He indeed was a messianic figure for many of the Jews in exile.
Plus, realistically, any movement to venerate Cyrus would inevitably adopt some aspects of the long-standing Persian pagan veneration/worship of him.
That is a good point.