Power Quickness Firebrand is going to be your alternative to Support Chronomancer for both Firebrigade and Hybrid compositions. Boasting moderate damage and consistent applications of Quickness, and Aegis, Power Quickness Firebrand can stay a competitive option for all skill levels.
This build is best paired with an Alacrigade, as you will not be able to replace a Support Chronomancer 1:1. While you will lose a Support Chronomancer's normal utility, you gain unique Firebrand utility via your Tome skills which can greatly aid a squad in high pressure situations.
Use once at the start and then use it everytime you gain a charge.
Use twice at the start and then use it everytime you gain a charge.
Use off cooldown.