Another take using Scimitar in different order

1. Take Attack action, equip Shortsword and attack with Shortsword [Attack action]
2. Equip Scimitar and attack with Scimitar [Nick Mastery]
3. Attack with Shortsword and unequip Shortsword [Extra Attack]
4. Unequip Scimitar [Free Item Interaction]
5. Take Attack action, equip Halberd and attack with Halberd  [Action Surge]
6. Attack with Halberd [Extra Attack]
7. Attack with Halberd [Cleave]
8. Take Bonus Action and attack with Halberd [Polearm Master]
9. Take Attack action and attack with Halberd [Haste]

Thanks, Plaguescarred. That makes sense.