I recently changed some on my 35, i broke the bead using small pieces of angle iron and a sledge hammer, i have always taken them of tractor as well same as you. Its a bugger of a job whatever way you look at it 😂
I’ve got a 135 with 4 original diamond pattern tyres from 1966. The thread is showing its age, and I would love to get hold of a new set. As far as i can figure, they are only available in the Uk, and will exceed 2000£ shipped to Norway.