Pretty much what I would have said and follows for all infantry, airborne or otherwise.
Mohawks, netting and field dressings on helmets would be out, along with the Thompsons (I think at least). If you really want to go for total accuracy you would need to carve back the cargo pockets on the trousers too. The M1/M2 Carbine was more common than the M3 Grease Gun as a section leader's weapon, so a lack of M3s is quite legit. Hessian sacking was used in lieu of nets on helmets, so a bit of light work on the netted helmets will save binning them.
The platoon MGs were either two M1919 Brownings on the light tripod, or two bipod M1919A6 as come with the set (never a mix though). You would have to convert M20 'Super Bazookas', but the WWII ones will work fine (in appearance but not in practice) as M9s for the best part of the first year. BARs soon became two per squad, as had been the case at the end of WWII.
If it was me I think I might be inclined to buy the U.S. Infantry (or just some single sprues) with the Airborne set to give the best effect for Korea. Keep the Thompsons for the Chinese... Plastic Russians with Thompsons might work for them, or possibly not.