Mt. Fuji hut wait list?

Hello!

I've unsuccessfully tried to get huts along the Yoshida and Subashiri trails, but they've filled up almost immediately after opening for booking. Are there any huts where you can wait list yourself?

If we don't manage to get a booking we're still fairly intent on making the trip. Any tips on getting sleep? We'll be going up and resting before doing the rest of the walk to catch the sunrise.

Thanks for any help!

Looking at this, it seems that you can make a reservation if it is Subashiri.
https://www.fujimountainguides.com/taishikan.html
By the way, I stayed at the Taishikan at Yoshida.
https://www.fujimountainguides.com/taishikan.html