I would put them two schisms beyond “Old Catholic”...maybe three.
I read up on “Old Catholics” when all that Milingo business was going on. There are a plethora of lines that claim to be “Old Catholic”...most are wacky quacky liberals, a couple are a bit more High Church.
Then there is the Polish National Catholic Church, with about 60,000 members in the US, which objects to Papal Infallibility, the doctrine of the Immaculate Conception of Mary, and the specifically Catholic doctrine of Original Sin. After the schism they became associated with the Episcopal Church in the U.S., but ended the connection because of the ordination of women. This is from Wikipedia. They are definitely a high church, not a scam.