Best bet to keep rally in Sweden might be Ostersund - Are - Trondheim area. That would have good synergies with Alpine skiing, big cities, good connections and everything. Possibility to split stages between Sweden and Norway like currently.

If not in Sweden, other potential options with rally culture could be Hokkaido or Canada. For sure Toyota and Subaru would like to see even two rallies in Japan. More extreme market choices could be Vladivostok area in Pacific Russia or even Northern China.