A suggestion u might be able to use.
Use and update a custom profile field with zero\one depending on if a user has a gallery (field has to update upon attachment upload or something). That way, you can choose to search for members with a gallery through the members list.
The gallery admin sections needs a field where you can input the custom profile field number. Otherwise, the query would need a fixed profile field number, which might not be the same for all members.
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