Ian - You still haven't dealt with the question of how you would manage your club if it became really popular and attracted huge numbers of singers. Tell them not to bother because they'd only get one song, and most of them would get to sing at all?

If, as you say, the ideal number is 8 or 9, why don't you take it in turns to sing in each other's living rooms and save yourself the hassle of organising public performances?