I've never driven to Slovenia, but have driven to Hungary a few times, and one can take more or less the same route that I tended to take: Calais, Charleroi, Luxembourg, Stuttgart, Munich, Salzburg, Klagenfurt.
That avoids 1) having to pay to use the Swiss motorway system, and 2) having to face the horrors of Italian driving. Negatively, it means that you see less alpine scenery en route.
It's fairly similar to the Michelin recommended route (which is Calais, Brussels, Aachen, Stuttgart.)
Interestingly enough, the Michelin "sight-seeing route" also avoids Switzerland and Italy!
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