play insanely tight preflop if the button straddle isnt mandatory and isnt on every hand. People think "the button straddle creates action" but actually it should do the complete opposite the fact that there is only 65 in the pot, and you have to put in a minimum or 50 to play and will often be oop means that each player especially the blinds should be playing so much tighter than usual. its terrible for the games. Limp hands like KKxx with one suit (i.e. hands that will do well in the limped pots but hate to get three bet) and mix in some limp reraises with high equity hands that dont play that well like bad AAxx. Raise in general with only strong high equity hands because of shallow stacks. Hands like 3456 are going to generally be junk in this structure especially from the ep positions or when the pot is going multiway with all the limps

In theory the button straddle should dissuade action, but in practice people just shovel the money in anyway. Given how much you have to invest to see a flop, the fact that a player with absolute position is highly incentivised to play, and the total lack of pre-flop fold equity, there's not much reason to play anything besides the strongest starting hands. The optimal strategy is probably to play very tight, just raise the best hands and fold everything else, perhaps going for a bit of limp-calling or limp-raising as phil suggested. But since this is a private game, that may be frowned upon. Is there a chance of getting kicked out of the game if you're not regarded as an "action" player?