Why not use a 2x5 or bigger 1,27mm pitch pin header instead (see picture). So we can use this as a "pico mini extender". Minimum 2x5 because of GND and VCC (and/or 5V). One can solder the header on top, on the bottom or not at all (breadboarding). There are ribbon cable connectors available for this kind of pin headers. Probably we should go for more pins (2x7 is doable without problem) to acheive a "universal" extender. say at least a combination I2C, USART , SPI and GPIO (analog capable) should be there. Should be able to use I2C, SPI and USART in parallel.
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