NOTE: it might still be desirable to set the software layout to sv_SE in your OS.
Remind me and I'll provide a picture of the layout.
I have tried making this as close of a match I could between the default ErgoDox EZ configuration and a standard Swedish Qwerty layout.
There are three special character buttons (acute accent, circumflex/tilde and apostrophe/asterisk) that don't have any buttons to map to naturally. I've put these at other places:
Acute accent (´) can be found in the lower left corner, conveniently placed to reach for making an é.
Apostrophe (') was put in the lower left corner, close to acute accent.
Circumflex (^) and asterisk (*) was placed in the lower right corner.
Tilde (~) and diaeresis (¨) I couldn't find a good place for, so I left those out. I could only get the buttons to produce a single one of the characters. How can I get it to work properly?
The Alt button on right thumb was exchanged for AltGr (RAlt).
I changed the backslash in the numpad (layer 1) for a minus. Thought it was more sensible.
I didn't find a good place for the "<>|" button, so that one was left out. That is a problem that really needs to be resolved. Pipe can be found on layer one, however.