Sorry PB,the old fashioned way to finance this would be (And mountains of problems to overcome for sure) is to increase the capacity of that area,not having your own space/seat ,charging less than elsewhere in the stadium.leaving enough to cover the investment .To pay the same....or more for a...
I guess most fans that like standing,are already standing.IMO the safe standing has to be cheaper for take-up. IS the north stand full to capacity every match at the moment ?
.....But if you had narrower seats,then you could get more in,assuming the exits,stairwells etc have some tolerance,maybe say an 10 %extra ,this could be the extra revenue that makes it all work.