NHS? Fudge that for a game of soldiers
I still think Kiwitea would be the best - yes its small but easy to fill and looks great.
Kiwitea was my first thought but honestly it's a bit ramshackle and hard to get to. I wonder whether they could do something with the grass pitch at Seddon Fields that was created for the WWC, they'd need to build stands though (might work very well if Foley is still looking to take over the Western Springs stadium)
Chuck a few stands on the opposite side to the club rooms? Could even just be scaffolding stands
Mt Smart #2 is a nice enclosed little ground - the John Walker lounge can be a good base for refreshments and there is a covered stand on the other side - has an athletics track but that could be sorted.