I would think safety-wise that would be fine, especially if you reweld and polish to fill the cut area... The barrel goes inside a steel receiver, so it's far from unsupported.
A member here, JohnEd, spent a lot of time and energy looking at finding proper bore-size, etc, Czech made barrels and came up empty. Sure you can find those threads by searching. He ended up going w/ green mountain barrels Apex sells... Other benefit is 16" so you can easily replace muzzle devices.