Oh yeah, a war with Denmark could make Karl XII order the construction of Göta Kanal in order to have a transport route that could circumvent the Sound. OTL he ordered Cristopher Polhem to start construction in 1718, but the whole project floundered due to a lack of resources and money and focus as the King died and was not resumed until 1810.
Thanks for pointing this out: never heard about it. But it seems that it was quite limited in its capacity (less than 3 meters deep). Wouldn’t it be cheaper to arrange for the 1855 solution? After all, everybody including the Perfidious Albion will benefit. Except for the Denmark, of course.
You have the right assessment of the priorities.Something to do once the palaces are done.