I use 2 srews and usually a claw hammer, and a block of softwood (or plywood).. just pull a bit move to the other, then repeat..
Only real problem, is to be carefull drilling or punching hole for the screw.. most of the time, I can do it with a sharp awl..
I had to figure that out for Kayaba forks Harley used before they went to Showa.. there was only about 2 or 2.5mm aluminum around the seal.. a lot of people broke them..
I figured out that method after seeing HD using 4 screws on a puller to get the main transmission seal out..