Hi fellow travelers, getting nervous that my booked flights might not work, and need some advice from you experts.

I am flying from Singapore home to Hawaii on the 25th, and have two unconnected flights:
NH802 (ANA flight to Narita arriving 14:25)
ZG002 (ZipAir flight to HNL leaving 19:30)

Both flights are Terminal 1. Now I have a carryon that is fine for ANA, but will need to be checked for ZipAIr since their carryon weights are crazy small. Thus I may need to check in to get my boarding pass once I arrive at Narita. Will I be able to gate check my bag airside with ZipAir?

I know some people have been caught up by this: zipair.net/en/important/60
but it seems to only talk about transferring from ZipAir to another airline (not the other way around like I am doing). So I am really hoping there is a way for me to get on ZipAir flight and check my bag Airside in T1.

Do I have a prayer here?
Mayur