Only receive notifications for Ping Sensors down

My problem is identical to this thread from 9 years ago: https://helpdesk.paessler.com/en/support/solutions/articles/25383-disable-notifications-for-all-sensors-except-most-critical

In essence, we want to receive email notifications for when a Ping sensor goes down in a specific group. Our first strategy for this was to use a filtered library, but that currently isn't an option due to this bug: https://helpdesk.paessler.com/en/support/solutions/articles/88764-collection-of-flitered-sensors-ignores-bypasses-linked-object

The only other option we've thought of that might work, is manually adding every single ping sensor in that group to a library, node by node. This obviously isn't really optimal, obviously, and I was wondering if anyone knew of a better method to achieve our goal (until the issue with library filters and/or tag inheritance is resolved).

Also note that we do have Ping sensors set as the master sensor/dependency, the issue is not that we get several notifications when a device goes down, but rather that we only care about notifications from Ping sensors and nothing else.