Brief update on this, finally started the challenge on FM23 with my usual Swedish lower level save. Picked up a job with Karlbergs BK and managed to win back-to-back promotions (Level 4 - Level 2) before being hired by BK Hacken.
Think the following says a lot about how open the Allsvenskan is rather than my abilities as a manager but...
Took over with 12 games and Hacken second bottom, managed to win the league on the final day! Talk about unfulfilled potential!
Managed to add the Swedish cup at the start of the following season, before getting my first hire from the "big five" with the Brentford job. Wish me luck!