The tube is "pressed", or a friction fit, in the block. All the methods chosen would've expanded it more, and increasing the difficulty. Acquire some drill rod just a smidgeon smaller than the tube's OD. From the top side, drive the remnant piece out. Flush the bore out with brake cleaner. Install the new one with some industrial epoxy at the bottom. Make sure there's release agent on the new tube so it is not glued in and can be removed if needed. The epoxy will give you a new "hole" and help hold things together.
