Liner removal tools are really useful, but they can also cost more than you want to pay for a tool that you're only going to need to use a few times. Thanks to 3D printing, you don't need to invest a bunch of money, and you still get a cool tool that will last.
These liner removal tools are solid. they're made of PLA plastic, and are designed to fit inside the 84mm bore of your 2 liter Alfa. Comes with one plastic liner tool, and one 1/2" fender washer and two 1/2" nut. You will need to supply a 1/2" threaded rod (available at any hardware store), and a top crossbar (a chunk of wood with a hole drilled in it works great).