You could use 2 hour wargames rules for the solo aspect and if you search for the wargaming addict he did a series of 6 games on a tablet I think. The last game was on youtube. These were based on the nuts campaign in northern France ww11 or if you are strapped for cash use the free chain reaction rules from the same company.
Taking this as a base You could easily transpose this onto a magnetic notice board, either as a counter based game or use small scale figures, either drawing your terrain on the board or again using small scale scenery with magnets stuck underneath.
I was going to do this myself but instead used the time to paint figures.