Custom Properties and Data Cards in perfect harmony? Is it possible?

So we are converting over to EPDM at my company. We already use custom properties linked into our Drawing Templates. Now that we are migrating to EPDM we have data cards that achieve the same thing as custom properties. Ideally I would like to use both at the same time. In data cards, fields like "DrawnBy" can be represented as a drop down with all the EPDM users listed automatically in the drop down box. Is there a way to do this in custom properties?

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