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The Dwarven Five Kingdoms or Druma seem to have a strict hands-off 'neutral' policy regarding various Andoren / Chelish / Moltune / Nirmathas feuds, and either could serve as a 'Switzerland' sort of nation.
The Dwarven mountain kingdoms would likely 'feel' more appropriate, visually, but Druma might be more mercenary feeling, with a 'sell weapons to both sides' sort of mentality (and a much stronger focus on banking and commerce, thanks to the heavy Abadarite presence).