If it were a small craft it won't be that difficult, for you can make an ECM umbrella instead. But for a fighter it's almost impossible due to lack of interaction with the other units.
Well, what I can only think is, an electronic support fighter as well as anti-dogfighter.
Pegasus Combat Controller (Standard)
Mass: 100 tons
Frame: Unknown
Power Plant: 400 XL
Armor: Heavy Ferro-Aluminum
Armament:
2 Small Pulse Laser
2 Large Pulse Laser
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 3080
Tech Rating/Availability: E/X-X-E-E
Cost: 20,186,500 C-bills
Type: Pegasus Combat Controller
Technology Base: Inner Sphere (Advanced)
Tonnage: 100
Battle Value: 2,758
Equipment Mass
Engine 400 XL 26.5
Safe Thrust: 6
Max Thrust: 9
Structural Integrity: 10
Heat Sinks: 12 [24] 2
Fuel: 400 5.0
Command Console 6
Armor Factor (Heavy Ferro) 714 36
Armor
Value
Nose 141
Wings 191/191
Aft 191
Weapons
and Ammo Location Tonnage Heat SRV MRV LRV ERV
CASE FSLG 0.5 - - - - -
Active Probe FSLG 1.5 - - - - -
5 Chaff Pod FSLG 5.0 - - - - -
ECM Suite FSLG 1.5 - - - - -
2 Large Pulse Laser AFT 14.0 10 9 9 0 0
2 Small Pulse Laser AFT 2.0 2 3 0 0 0
So, it's the idea. Only put the weapons on aft, means you can't attack properly unless the enemy got your six. It would act as the flight's rearguard. Also with Command Console, electronics and and chaffs the stacked fighters are able to be shielded by the pegasus.
Pegasus Combat Controller (AMS)
Mass: 100 tons
Frame: Unknown
Power Plant: 400 XL
Armor: Heavy Ferro-Aluminum
Armament:
2 Small Pulse Laser
2 Large Pulse Laser
4 Anti-Missile System
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 3080
Tech Rating/Availability: E/X-X-E-D
Cost: 20,780,500 C-bills
Type: Pegasus Combat Controller
Technology Base: Inner Sphere (Advanced)
Tonnage: 100
Battle Value: 2,837
Equipment Mass
Engine 400 XL 26.5
Safe Thrust: 6
Max Thrust: 9
Structural Integrity: 10
Heat Sinks: 12 [24] 2
Fuel: 400 5.0
Command Console 6
Armor Factor (Heavy Ferro) 714 36
Armor
Value
Nose 141
Wings 191/191
Aft 191
Weapons
and Ammo Location Tonnage Heat SRV MRV LRV ERV
4 Anti-Missile System NOS 2.0 1 3 0 0 0
CASE FSLG 0.5 - - - - -
Anti-Missile System Ammo (36) FSLG 3.0 - - - - -
Active Probe FSLG 1.5 - - - - -
ECM Suite FSLG 1.5 - - - - -
2 Large Pulse Laser AFT 14.0 10 9 9 0 0
2 Small Pulse Laser AFT 2.0 2 3 0 0 0
This variant is similar with the standard one but instead of chaff it has AMS toward the front, and it would stop the enemy missiles targeting your teammate.
Pegasus Combat Controller (Robot)
Mass: 100 tons
Frame: Unknown
Power Plant: 400 XL
Armor: Heavy Ferro-Aluminum
Armament:
2 Small Pulse Laser
2 Large Pulse Laser
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 3080
Tech Rating/Availability: E/X-X-F-F
Cost: 20,224,375 C-bills
Type: Pegasus Combat Controller
Technology Base: Inner Sphere (Experimental)
Tonnage: 100
Battle Value: 2,486
Equipment Mass
Engine 400 XL 26.5
Safe Thrust: 6
Max Thrust: 9
Structural Integrity: 10
Heat Sinks: 12 [24] 2
Fuel: 400 5.0
Small Cockpit 2
Armor Factor (Heavy Ferro) 714 36
Armor
Value
Nose 141
Wings 191/191
Aft 191
Weapons
and Ammo Location Tonnage Heat SRV MRV LRV ERV
Active Probe FSLG 1.5 - - - - -
CASE II FSLG 1.0 - - - - -
Shielded Aerospace Smart Robotic Control System FSLG 8.0 - - - - -
2 Chaff Pod FSLG 2.0 - - - - -
2 Large Pulse Laser AFT 14.0 10 9 9 0 0
2 Small Pulse Laser AFT 2.0 2 3 0 0 0
The more expendable robotic fighter can harrass the pursuiting enemy while the other manned fighters are retreat. Note that shielded smart robotic units are considered as having an ECM suite by default.