I used to work on mods for the Close Combat RTS series. In that game, heavy infantry weapons were classed as vehicles. Would it be possible to code Maxim 1910s of Scheweres Heavy MG-34/42s as a small 'vehicle'?
It would have two crew positions, a gunner and a loader, that if one is picked off the other could fire.
You would allow the gunner to move the gun 'vehicle,' at a very slow rate, but when the loader was also present the vehicle would move twice as fast (and the loader would get the 'tripod' in their animation while moving (or help push the carriage)
The same conditions would apply to firing. Without a loader, the gunner would have to pause between belts. With the loader present continuous fire would be possible. The loader would feed in belts and change barrels (secondary fire?), as well as spot.
The gunner would be able to deploy the gun with the 'fix bayonet key.' Then they could use the mouse wheel to switch from, for example, looking around above the gun (still be able to fire), looking through the sights (optics), or ducked under cover (the gunshield on the maxim). The loader should have similar viewpoints with binoculars.
Then you could let anyone man the HMG as acrew, or have a specific class to operate it.