I'd be dualling a fighter to a thief over a thief to a fighter. The rewards are greater, there's no need to continue levelling up a fighter after you've got all the proficiencies you want, and thieves have skills that are better to continually boost throughout the game, like set traps. And a berserker thief would be neat, too.
Sylves, Jan doesn't need to get to higher levels to be good at what he does (thieving) since he's also an illusionist, but if you're dead set against him... perhaps the reason you can't dual class is because your character's lawful good. From what I seem to remember, thieves can't be lawful good, and you can't perform a dual class which will result in a conflicting alignment.
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