Mashing together suggestions from Shurrikhan, CKNovel and Rongway, while adding a bit of my own:
Single target:
(NEW)
Action: Flash Point
Type: Weaponskill
Cast/Recast: Instant / 1.5s
Range/Radius: 25y / 0y
Delivers an attack with a potency of 190, overheating your weapon.
Heat Gauge Cost: 50
Additional Effect: Grants 5 charges of Overheat.
Duration: 15s
Additional Effect: Grants Vent Ready
Duration: 15s
Additional Effect: Reduces the recast time of both Gauss Round and Ricochet by 15s
Action: Heat Blast
Type: Weaponskill
Cast/Recast: Instant / 1.5s
Range/Radius: 25y / 0y
Delivers an attack with a potency of 170.
Overheat cost: 1
Additional Effect: Reduces the recast time of both Gauss Round and Ricochet by 15s
Recast timer cannot be affected by status effects or gear attributes.
(NEW)
Action: Vent
Type: Weaponskill
Cast/Recast: Instant / 2.5s
Range/Radius: 25y / 0y
Consume all Overheat charges and deliver an attack with a potency of 300.
Additional Effect: Increase potency by 30 for each Overheat charge consumed.
Can only be executed while under effect of Vent Ready
AoE:
(NEW)
Action: Pressurize
Type: Weaponskill
Cast/Recast: Instant / 1.5s
Range/Radius: 12y / 12y
Delivers an attack with a potency of 170 to all enemies in a cone before you overheating your weapon.
Heat Gauge Cost: 50
Additional Effect: Grants 5 charges of Overheat.
Duration: 15s
Additional Effect: Grants Eject Ready
Duration: 15s
Action: Auto Crossbow
Type: Weaponskill
Cast/Recast: Instant / 1.5s
Range/Radius: 12y / 12y
Delivers an attack with a potency of 140 to all enemies in a cone before you.
Overheat cost: 1
Recast timer cannot be affected by status effects or gear attributes.
(NEW)
Action: Eject Magazine
Cast/Recast: Instant / 2.5s
Range/Radius: 12y / 12y
Deliver an attack with a potency of 160 to all enemies in a straight line before you.
Additional Effect: Increase potency by 10 for each Overheat charge consumed.
Can only be executed while under effect of Eject Ready.
So in summary:
Single Target = Flash Point > Heat Blast x5 > Vent (Can be activated early)
AoE = Pressurize> Auto Crossbow x5 > Eject Magazine (Can be activated early)
The downside being that while Hypercharge is removed, Vent and Eject Magazine are introduced, alternative would be to have them be swapped in when Overheat charge is at 1 as a finisher, removing the extra potency bonus and removing Vent Ready and Eject Ready.