If a device is plugged in when you install the ixo-usb-tag Debian package, then the udev rules should be triggered causing the fxload to run.
udevadm control --reload-rules
udevadm trigger -v -t subsystems -c remove -s usb -a "idVendor=abcd"
udevadm trigger --attr-match=subsystem=net
<@mithro> tumbleweed: What is the best way to run some udev commands after a package is installed?
<tumbleweed> in the postinst script
If a device is plugged in when you install the ixo-usb-tag Debian package, then the udev rules should be triggered causing the fxload to run.
https://wiki.archlinux.org/index.php/Udev#Testing_rules_before_loading
http://manpages.ubuntu.com/manpages/dapper/man8/udevplug.8.html