[Nut-upsuser] Simplest way to fully Disable NUT without uninstalling

[nut-upsuser at kosowsky.org]

I would like to keep NUT installed but disable it completely at times.
I tried both 'disabling' and 'masking' all the following 'systemctl services
    nut-server
	nut-monitor
	nut-client
	ups-monitor
	nut-driver-enumerator
as follows:
   systemctl disable nut-server nut-monitor nut-client ups-monitor nut-driver-enumerator
   systemctl mask nut-server nut-monitor nut-client ups-monitor nut-driver-enumerator

But I still have 2 '/sbin/upsdrvctl' processes that are respawned periodically:
Specifically:
    root      123446  0.1  0.2   2320  1280 ?        Ss   11:27   0:00 /bin/sh -c NUTDEV="`/usr/libexec/nut-driver-enumerator.sh --get-device-for-service APC_RS900`" && [ -n "$NUTDEV" ] || { echo "FATAL: Could not find a NUT device section for service unit APC_RS900" >&2 ; exit 1 ; } ; /sbin/upsdrvctl start "$NUTDEV"
    root      123473  0.0  0.3   2220  1408 ?        S    11:27   0:00 /sbin/upsdrvctl start APC_RS900

These processes respawn every few minutes and clutter my syslog with error messages.

So, what do I need to do to fully disable NUT?
And what are the minimum services I need to disable to make this take effect...

I am running Bookworm/Debian 12 on a RPI5.