How do I edit an alarm by label using shortcuts

I'm attempting to create a shortcut that acts as a reminder every 20 minutes. I've recently updated my phone and I'm seeing two issues in the way of this.

1. The "toggle alarm" shortcut action now references alarms by time in the variable list rather than label (even when labels are assigned to the alarm).
2. There's no way to edit or delete an existing alarm without entering the clock app, which in some ways defeats the purpose of shortcuts.

I've attempted to use a timer for the 20 minute thing, but although we can edit and stop those, there's no automation option to start a new shortcut at the end of a timer.

It is theoretically possible to to have a wait action with many repeat statements, but that makes it impossible to:

• Know if the shortcut is running
• Stop the shortcut
• Know how much time is left in the timer
• Run other shortcuts

Any help is appreciated.