For the existing 9-man riflemen squads, they shoud be updated to the standard of the 66th Infantry Chinese (USA) rifleman squad that has an AT gunner, an Engineer, and 7 riflemen all armed with the squad rifle.
This would mean converting 2 riflemen into an AT Gunner and an Engineer for the Italian 3rd Battalion, Soviet 66th Guards, Soviet 359th Infantry, German 1st Volkssturm, and Moroccan 1st Group Auxiliaries. No need to give them any other weapons other than what they currently wield…but these squads desperately need an engineer to be competitive with other squads and brings them to the modern standard of the Chinese squad.
Edit: and the German 452d Infantry and 51st Grenadier squadrons
I don’t think this is possible, the next best option would be if the devs gave people who already own the squad a second version with a new layout of members.
I support the idea that the old rifleman squad needs to be strengthened, or rather, it should have been strengthened, just like the assault and machine gunner squads. Currently, the nine-person rifle squad and the communication squad have not been given due attention. I hope these can be improved and optimized so that their appearance rate and capabilities can be enhanced to achieve what was previously unattainable.