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> there has to be a physical switch

Or literally any $1-3 SPDT RF switch? >80% of which are directly optimized and advertised for wifi and bluetooth?

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For a Zero, that’s a big BoM item given this would be used by relatively few people.

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Yeah, western parts are expensive.

Here's a capable switch for $0.07.

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There are RF connectors by Hirose which are bypassable due to a built-in switch, but I don't think pigtails with them are common.