All published HILL WAR 1967 missions can be found here:

HILL WAR 1967: 01 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2833869436
HILL WAR 1967: 02 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2833875376
HILL WAR 1967: 03 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2833878116
HILL WAR 1967: 04 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2833879288
HILL WAR 1967: 05 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2833884329
HILL WAR 1967: 06 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2843290088
HILL WAR 1967: 07 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2843684963

Yes, they can be played with only one player. Both infantry groups should be able to perform most of the tasks with help from the support system. The pilots and the tank crew can aldi be played solo, but probably won't be able to complete all tasks on their own. All of the missions basically play themselves if you start them. You may even play as a grunt in one of the infantry squads in most of them, and let the AI act as group leader.

Yeah, if you host your own server and play you can change your team and respawn

Will this be possible to complete in sp?

Just found these on the bohemia forum and they look promising. Havnt played them yet. I’d suggest joining the SOG:PF discord server if you havnt already and posting them on there so more people are able to see, play and enjoy them.