You understand that adding stall strips makes the wing stall sooner, not later, just that the inboard part of the wing stalls before the tip (hopefully) and the stall will be more "manageable". It sounds as though you are trying to fix something that ain't broke. Why not fly the plane first, check out its slow flight manners at altitude get to know how it stalls, then if you think the stall is not manageable, look for remedies, maybe stall strips, maybe just moving the balance point forward.