Secureboot : Grub error "shim_lock protocol not found"

[2Torr]

@longpanda, @vernetroyer,

I believe I figured out how to workaround this issue.
It turns out that I needed to enable a Ventoy option using VentoyPlugson app:

Under Global Control Plugin:
VTOY_LINUX_REMOUNT: changed to 1 (from default 0)

After I did that, I'm now able to boot Ventoy USB memory stick and run systemrescue images!
Hope this helps.