I'm planning trip to Hokkaido. SIN-HND and HND-HKD on separate JL tickets. As this is an international to domestic transfer, I understand that I need to retrieve my bags and re-check them in HND.

Question: Will I be able to still obtain the boarding pass for HND-HKD in SIN? (Booking that segment on the JAL Japan Explorer Pass fare, which doesn't allow pre-assigned seating, so I'd like to check in as early as possible).