Jormuttar's FocusMarker 

Helps you set a focus target, apply a raid marker and interrupt your focus, with Mythic+ groups in mind.
This project started when I often had to change my focus target's marker because another player had the same one. Often players announce their marker just before the key starts, making it difficult to go into my macro and change it in time before the key starts.

This addon will:

• Create "Set focus" and "Kick" macros (will not overwrite unrelated macros).
• Choose your marker and macro icon.
• Optionally announce your marker automatically to your party, when entering a current season M+ dungeon. 

It has a compact view, managing your focus/interrupt macros in one window. 
Preferences are shared across your account so your marker and preferences will 
carry over between characters.
The "Stop casting before interrupt"option is saved to individual characters.

To get started:

• Type /fm and choose an icon and marker.
• Drag the macros onto your action bars and bind your keys.

That's pretty much it.

Feedback is very much appreciated :)