I am not sure if it woudl fit the APB Theme, duall wielding would be much too arcadish and also some wepaons dual wielded, that has other broken niches, like those tight camping spots with PDW and N-FA. while most other dual wield chocies would be quite inferior, due to the reduces accuracy.
honestly, whats the point of limiting it to the guns you mentioned? a less accurate FWB with increased mag? no one really needs that. and to look cool? well maybe thats something for some events to do.
So if we would get some dual wield mechanics we would need some properly implemented mechanics that make it viable at all. Maybe some secondary unrelated wepaons and own dual wield specific weapons. They coudl then mechanic wise be as (in)anncurate as a the Tommy gun. but just with different animation.
BTW, this raises the most important question of all: will the new devs get soem animations guy? Because iirc, G1 doesn't haad one anymore.