Korg Kaossilator Pro rubber keys

Hey everyone,
I’m currently restoring a Korg Kaossilator Pro (KO-1PRO 2nd gen) and am missing sevral rubber keys. Does anyone know where these can be found? I’ve reached out to Korg as well as partsforparts after not having found them here, but to no avail. I’ve seen a set of the 1 trhough 8 keys on ebay, but the shipping cost alone is pretty bonkers…

any leads much appreciated!