Ok, that's your mod, so np about wool being luxury
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The still movement of arquibusier is redcoat - looks funny.
As for the historical personality of Stephen I, he actively participated in wars joining forces with HREmperor, Poles and Byzantines at different stages. Haven't seen anything that would allow to pick him as an isolationist.

The still movement of arquibusier is redcoat - looks funny.
In raw BtS itself there is no leader who refuses OB at Pleased, even Toku, spare the Friendly.1. It could be that he didn't do it in the real world. (like Tukogawa (or something) in vanilla RFC)
As for the historical personality of Stephen I, he actively participated in wars joining forces with HREmperor, Poles and Byzantines at different stages. Haven't seen anything that would allow to pick him as an isolationist.