I do have a connecting flight in NRT (with less than half the connection time now required). Was told by Qantas that their request for accommodation on my behalf was rejected by JAL, and I should contact JAL directly to get them to put something in writing that I could use to claim the costs on travel insurance.
Called JAL and explained the situation (noting that it wasn't particularly fair that their changes are costing me, and that I wasn't offered any same day alternatives) and got told no dice again, but they would call me back once they got a letter for my insurance authorized.
Got a call back shortly after saying they will now pay for accommodation - up to 15,000 JPY pppn. I need to book and pay for it myself, then give the receipt at the check in counter to be reimbursed.