I figured I'd try my hand at piecing together a few of the other ideas that people have suggested:
Mile Mayhem: Kwinn v2 head, Dusty v13torso/waist, Destro v23 arms, James McCullen legs, Resolute Duke Jet pack, James McCullen pistol, and new helmet.


Streethawk: Resolute Duke helmet, ROC Flash head, ROC Hawk torso/waist/belt, Snow Job v3 arms, Hawk v6legs, Snake Eyes v40 bandolier, Pit Commando rifle, and ROC Hawk pistol.

Frostbite: Double Clutch v3 head, ROC Sgt Stone torso/waist, Snake Eyes v46 arms/legs, Artic Hiss Driver fur neck, Duke v30 rifle, and a new hat.

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Frostbite:
Head - Arctic Shipwreck TRU Exclusive
Body - Arctic SE/Ice Dagger Driver (Frostbite lol)

Accessories :
Goggles from POC Gen. Hawk
Silenced M-4 - POC Jungle Duke
Ice Machete - POC Jungle Duke
Trench Shovel - Renegades Tunnel Rat
Blanket - Arctic Doc

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Classic Duke.

Kwinn torso/ or firefly torso and ultimate firefly upper arms, mouse forearms.
Lifeline upper legs, Trooper lower legs.
Either poc or renegades duke head? Maybe a new head sculpt.
And new, more modern webgear. Keep it the bandolier, but a little more updated.

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GI Joe Reservist:
Retaliation Airborne head
Resolute Pilot Duke chest
POC Beachhead arms
POC Skydive legs
Lifeline helmet
ROC Flash chest armor
POC Jungle Duke M4

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Oh, good call Jay. Another completely forgotten figure that would be fun to see brought back.

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I like bucky idea but still hoping for concept case GH

I would absolutely love to get the concept case Gung Ho, but I unfortunately can't see that happening since that figure requires too much new tooling.