Card edge connector and perfboard for EEPROM cartridges
You could try and clone or use something like the following small serial FLASH breakout boards/modules.

Also remember that you can usually get away with just 4 or 5 connections and this might give you ideas for making a smaller connector choice.

http://www.ebay.com/itm/like/182238847961?item=182238847961&amp;lgeo=1&amp;vectorid=229466&amp;rmvSB=true

http://www.zeppy.io/discover/us/i2c-eeprom

http://www.piccircuit.com/shop/pic-io-board/60-icm13-eeprom-module.html