Looks like the valve seal has disentegrated and that would certainly explain any oil consumption and/or smoke upon startup issues.
Removing them can be a bit of a wrestling match all depending. I have a couple of pairs of homemade needle nose pliers with a couple of half rounds welded onto the end of each jaw. These were used back in the very similar looking problem prone VW valve seal days. Closing the pliers creates a round tube which grasps the valve seal firmly.
Use care tapping the new seals in as it’s very easy to mangle the lips on them. Hope that helps.