Worse case, since you have OW status, you could just book a ticket on JAL and have piece of mind https://www.jal.co.jp/yokosojapan/

I don't know schedules by heart, but since NRT is not the airport for domestic flights, the (very few) domestic flights departing from there seem to be timed specifically for International connections, so I don't think I would be too worried.


Also, do note that, IIRC, these flights are operated by ANA Wings, and I have seem many flights with Y only 783s.


Additionally, you can upgrade at the gate for 8,500 JPY, which will give you the F perks.