Thanks!
That finally works.
For anybody else coming to this thread for help, here is the full list of steps to get 4.18 working on a Raspberry Pi 5:
$ rm /lib/modules/6.6.31+rpt-rpi-2712/kernel/drivers/media/pci/hailo/hailo_pci.ko.xz
$ dpkg -i hailort-pcie-driver_4.18.0_all.deb
$ dpkg -i hailort_4.18.0_arm64.deb
$ reboot
$ modprobe -r hailo_pci
$ modprobe hailo_pci force_desc_page_size=4096