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Custom data is not stored in saved characters - only the record that they have selected a particular item (and details of how they selected it and its current state), it is only stored in the .user files created in the editor, which must accompany that character in order to make use of the content there.
The way I would do this is to buy the regular belt, paying the construction cost you calculated, and then use adjustments to get the final version - so add a +4 enhancement bonus to a specific score as an adjustment, which will upgrade the +2 enhancement bonus that the belt is giving to that score.
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