Description:
The Bf 109 K-9 was a improved variant of the Bf 109 K-4, it was lighter and has a more powerful engine, making it more maneuverable, it also has air brakes that helps the aircraft to lose speed.

Some fictional history:
The Bf 109 K-9 first flew in mid 1945 (A Alternate Universe where the war didn’t ended yet), it fought against the Allied powers, facing airplanes like the P-80 Shooting Star, P-51H Mustang, the Superfortress, the late Spitfire, etc. The Bf-109 K-9 could also service as an escort fighter, but the escort capabilities was limited, until Heinkel made a fighter with better capabilities of escorting bombers.

Late variant:
The Late Bf 109 K-9 has the same fuselage as the early version, the only difference is that the canopy was replaced by a bubble canopy.

The aircraft it's armed with:
- Two 13 mm MG-131
- One 30 mm MK-108 (65 ammunition)
- Four 125 mm rockets
- One 250 kg bomb SC250JA

Controls:
- Activate 1: Open/Close canopy
- Activate 2: Change vision position to try to see under the nose
- Activate 3: Extend/Retract airbrakes
- Activate 4: Drop bomb
- Activate 5: Drop Rockets
- Activate 6: None
- Activate 7: None
- Activate 8: None

Flight perfomance:
(All the perfomance without the suspended armament)

Max speed in a straight line at 3000 ft: 443 mph / 712 km/h

Turn time at 300 mph
- Vertical: 16 s
- Horizontal: 14 s

Speed to take off:
- Without suspended armament: 118 mph / 189 km/h
- With suspended armament: 131 mph / 210 km/h

Additional Armament:
- MK-108 Gunpods
- MK-103 Gunpods
- MG-151/20 Gunpods

Variants:

Bf 109 K-9 (Early)

Does this sounds familiar?

Pros:
- Leading-edge slats help the Bf 109 maintain its maneuverability at low speeds
- 30 mm MK-108 can pulverize any small aircraft (most of the time)
- Airbrakes can help the aircraft for landing or not to overrun an enemy aircraft
- Good visibility inside the cockpit

Cons:
- MK-108 is difficult to use against small and agile fighters
- MG-131 aren't powerful enough to quickly shoot down an enemy aircraft (especially bombers)

Note: You can only drop the bomb with Actvate 4

A Bf 109 K-9 escorting a Me 464 B-2

based on this

If you want, remove the suspended armament to be only a fighter.