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As a slightly off the wall suggestion (and has been discussed elsewhere), The Walking Dead: All Out War might work for a solo or cooperative game (playing as US and allies).The Threat level mechanism handles the opposition reinforcements, the die colour quality of opponent and the Headshot/bite symbols indicate heavier weapons (again dependent on die colour).Actions to reduce the Threat Level can be viewed as off table distractions drawing the opposition's attention away.Additional mechanisms are needed for "AI" for the opposition, a simple decision tree would work, depending on their situation. Target priority based on the Noise or Mayhem rules (if you make Noise the nearest opponent with Line Of Sight shoots at you, if you make Mayhem, every opponent with LOS and in response range shoots at you).Emplaced belt fed weapons can fire everytime (limited arc/LOS), everything else can "shoot" once (might have multiple shots)Just a thought.
Must admit, that sounds a pretty good idea, certainly for a small Hue Board, say 4 by 4, could cut down on figures as well if solo, as the NVA would mostly be hidden, and imagined rather than on table figures.