Ultimately I did the following (assuming I did not need vboxhost).
- Uninstall dkms and acpi_call-dkms
paru -R acpi_call-dkms dkms
- Delete the /var/lib/dkms/vboxhost director recursively
sudo rm -R /var/lib/dkms/vboxhost
- Re-install dkms and acpi_call-dkms
paru -S acpi_call-dkms dkms
- Ran a dkms status to make sure no errors: