After digging more deeply into T155822 we decided enabling folding wasn't the solution to the problem, but since we did 90% of the work to do it right (i.e., excluding å, ä, and ö), we should just finish that off.
Note that this will only cover analysis and deployment of the config. We still have to re-index the Swedish wikis at some point to make the changes live.
Re-index task: T161139: Reindex Swedish language projects once analysis update is deployed