The PoD can only be a French decision, as the French were the first in both areas (Verazzano, 1524). So, in order for New Sweden to be seated on the Saint Lawrence, the French would have settle for more southern colonies before the 1620'. OTL, the French colonization efforts in America were in the 16th c. some settlers colonies, with a strong huguenot component, in Brasil (France Antarctique, 1555-1560) and Florida/Carolina (Floride, 1562-1566), or without protestants, in Canada (Quebec, 1541). Only the trade post of Tadoussac in 1599 managed to survive. A first PoD could to redirect all settling efforts towards "Francesca", as Verazzano called it.
Another PoD could be linked to the 17th c. French colonization. Champlain's efforts, as feeble as they may appeared, were larger than the Dutch's. Owing to the Franco-Dutch alliance (treaty of Compiègne, 1624), the colonization efforts of the region would be reasonably non-concurrential. One important difference is when things would turn sour, in the 1670', the French and the English would partition the Dutch colony. At that time, the religious question would be asked. If the local authorities are unable to sort out a toleration act (at the time, Protestantism was still legal in France itself), the colony would be crushed by the English at the first opportunity. If, on the other hand, Francesca can become a refuge-lite for the Huguenots, it can grow even faster than OTL. In 1685, Louis XIV was persuaded there was almost no protestant left in France after decades of discriminations. The size of the Huguenot population surprised him, but did not change his mind. ITTL, he would know there are hundreds of recently-conquered protestants on the other side of the Atlantic, he could very well postponed his decision, as many advised.