I just rebuilt my 2960 without any of the special tools. First first stage rebuild.
I used a long bamboo skewer to get the seat out and a 90 degree pick as the 'flat top' to seat it. Doesn't take much force so you won't mar the plastic. Just be smart and gentle
That's great; but I've also removed, on occasion, wooden fragments from first stages, from what may have been skewer use; so too, bits of plumber's tape and rubber fragments from what may have been good, old pencil erasers, used as a drift -- all just enough to scour pistons, damage seats, and eventually wreak havoc with the IP . . .