In theory I understand, but I am confused here:I think this is what you're looking for: https://linustechtips.com/topic/153...rted-motherboards-with-clover-a-simple-guide/
I didn't read all the details but it seems to accomplish boot from USB with the OS installed on NVMe.
Step 15. What does it mean "install as usual"? Usually, I have bootable instal USB with ISO (made with Rufus). This is how I install OS.14. Now reboot your PC, and select boot drive to the USB/SD drive (either using boot menu shortcut or set it up manually via BIOS boot order). If you see the clover boot menu, congrats!
15. Now shutdown your PC, plug your NVMe drive (if not already), and try to boot from it. If your NVMe drive doesn't have any OS installed, please install it like usual.
16.Now, after installing either your NVMe drive or installing the OS inside it (or both), you can directly boot to the NVMe drive via the clover boot menu selector!
So how do "install" after booting with clover?