Simple steps to use with https://firmware-selector.openwrt.org to generate an OpenWrt image for Raspberrypi with Wifi enabled and travelmate for CM4 Router.
Packages:
# Expand root filesystem to whole sdcard
parted losetup resize2fs
# USB Tether for phones
kmod-usb-net-rndis kmod-usb-net-cdc-ncm kmod-usb-net-cdc-eem kmod-usb-net-cdc-ether kmod-usb-net-cdc-subset kmod-nls-base kmod-usb-core kmod-usb-net kmod-usb-net-cdc-ether kmod-usb2