Unfortunately there's not really any way to make a simplified editor. The best best it to find an item that functions in a similar manner and go from there (in this case goggles and/or items that grant spell casts, like the Saboteur's goggles from the Advanced Class Guide).
About halfway down the Wondrous tab there's the tracker, you're going to want to set the 1/day usage there, and right at the bottom of that section is "Castable Spells", that's where you'll add read magic.
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