There probably should be a way to get access to KMD private key.
But I am not sure if it is safe?
Would not be other coins on Ledger not in safe then?
How much jumblr were distributed per user or KMD owned? What is the value?
I believe to claim the jumblr you would need access to the private keys associated with your nano ledger s kmd address.
p.s. I currently hold my kmd on a nano ledger s, not getting the 5% is compensated by knowing my funds are secure.