My first venture down the rabbit hole was a long time ago when I had to regularly work with ANSI keyboards which have one less key on them meaning that I was missing a symbol key in all languages that use ISO standard keyboard layouts. Then I got very fed up moving between Danish/Icelandic/German/English because everything moved around so much that it was impossible to remember and programming on those layouts makes some of the symbols horrible to reach.
Hope you find a Swedish layout that works, the starting issue with just using the default firmware in the Model 01 is that it does not have an AltGr key (it only has Alt) so I recommend starting with the thumb layer and adding it.