Uninstalling a Loadable Kernel Module

[Bernardo Pastorelli]

The uninstaller for my product has to remove a loadable kernel module that cannot be unloaded unless the machine is rebooted.
So I would like to perform some steps that allow to clean-up the system so that at the next reboot my kernel module will no longer be present.
I'm running on HP-UX 11i and it seems that kminstall -d doesn't perform any action if the module is busy and cannot be unloaded. What can I do to solve this problem?
Is there something like the -a option of kmmodreg added in version 11 1.5?

Thanks in advance,
Bernardo