As TwoGun said, a reissue of the rules with different flluff and all that- It could work... and using the current figures (if PA has all the molds at least) can fly with minimal re-do of force lists.
Really!!
And if you wanna go generic for some forces, it too can work.
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Ok…. The ideas in my brain
Go with a semi-post apoc Earth- say 150 years in the future. Some space travel but mostly to
Mars, Luna and a highly terraformed Venus
Energy Weapons are all ship and Large Tank based, as man-portable still is not cost effective/technology has not progressed to the point where it can be done reliably.
The Factions- and please keep in mind, minis for comapies like Victory Force and that *other* company can be subbed in.
North American Confederation (most of the US, Canada, Mexico): Capitol Figs obviously. Troops are armed as they are armed, which means Free Marines could have their blades back as an option (call it a 1 point option.) Three possible Lists - Army (all infantry, rangers, scorpions), Navy (Heavy Infantry, all Marines, Seals (Sea lions) and a SOCOM list (Marines, Rangers, Seals only!)
Empire of the Sun (Japan, east Asia): A return to the old days of Bushido and honor… and Expansionism. Mishima figs obviously. There is plenty of figs out there that can be added to this to rep the Monk orders and such, between Francisco's and whatever Shawn Althouse found. A new troop type to represent Chinese Hordes but I think there are minis out there for this. Stats could be equivalent to Cap LI but with few support weapon types.
English Protectorate (UK, Australia, NZ) Not terribly has to be said- the established figs are fairly easy to spin into other stuff. Regulars as Territorial Guard, Trenchers as Regular Army, The various Beret types as SAS set up for specific actions. The Wolfbanes are very Road Warrior and I can see them as Aussie/New Zealand… or even Russian Far East (Siberia) as the former Soviet Union descended into areas of Anarchy.
Franco-Prussian Union (FPU): Bauhaus and the German VF models. Easy as hell to rep for this…. And can be fluffy. Militia as French and German Guard, the Hussars being the Regular Forces and Dragoons being Royal Guard or something…
Citystate of Rome: The Church goes Militant!! (like it never was before
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Russia… is a bit harder but doable with GW steel Legion figs.
Africa and the Middle East. Almost anything as various factions and deserters went there to carve their own kingdoms- the South Africans being techno-savy enough to have good gear and could be Cybertronic- relying on Technology to do what they need for ground troops.
Cresentians could be used for them Jyhadists out of there… or some of the Assault Group figs.
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Of Course, the UN would be built to a degree like the UN is from the Dirtside universe. Good Gear and guns- just always damn outnumbered. Maybe use Cadian or Marine Scout figs for them. Who knows?
South America- Catachan figs. Nuff Said.
I know I am missing a lot of possibilities… but with minimal reworking of stuff and good fluff, very doable.