As a follow up to the brake drum investigation post (link below)
Gave the drum a good cleaning with the poor mans Dremel rather than the lathe, and yes the crack is too bad to use. Can’t take the risk with brakes.
As can be seen, the crack covers the entire width of the braking area. Should be able to salvage the hub as it appears to be the press in type. So now looking for new drums, update to follow.