Normally, a USB-C hub with PD passthrough would reserve 15W for its own ports when connected to a USB-C PD charger, even if the host is disconnected or shut down, see https://imgur.com/a/VWweOip

I'm surprised that yours don't, do you have a link for it?

Anyway, have a look at https://www.amazon.com/s?k=usb+c+hub+pd

If you just need USB A or C ports, you can consider ACASIS, Minisopuru, PULWTOP

https://www.amazon.com/PULWTOP-Delivery-Support-Multiport-Chromebook/dp/B0BND5487P

This is a 5 port USB-C adapter with 4 data ports and 1 power ports.