As eyes glaze over, apologies for putting too fine a point on the lifeline/stanchion discussion. There is ambiguity enough to satisfy rounds of debate. For example, I read the lifeline support being at 87", not 78". If adding stanchions just forward of the shrouds is on the menu, one alternate consideration is using the upper shroud as the lifeline support. Though not always possible if the genoa clew is below the lifelines, upper shrouds have been used as a lifeline support for decades. There are multiple ways to do this: one is a thimble lashed to the shroud. Or use a cable clamp. Even easier, but more difficult to remove, is to take a clove hitch around the shroud with the dyneema.