Can't Set Default Value for LOV Presentation DB Column

I have a simple form. One of the fields is populated using a named, dynamic LOV with the following source query:
SELECT USER_NAME DISPLAY_VALUE, USER_ID RETURN_VALUE
FROM USER_ACCT
ORDER BY 1
I want the default user to be public, which is one of the possible values returned by the above query. However, I just can't find a good way to do this.
If I put the following query in the Default section, nothing happens.
SELECT USER_ID
FROM USER_ACCT
WHERE USER_NAME = 'PUBLIC'
If I look up the ID and statically put the value in the Default, it works (This isn't acceptable . From environment to environment the value will differ)
If I put the SQL in an after footer page process, it sets the value correctly in the session but, does not update the display.
If I try to put it in the Post Calculation Computation section, it merely produces an error.
I'm sure that I am missing something simple but, I have not spent an hour and half on this.
Someone please help!
-Joe

A function I'd like to see is the ability to not only create a select list dynamically, but also set the default value of that select list's item to the first (or Nth?) value on that list. This could be specified in the builder by an item option.
E.G., if a select list LOV returns three values: "foo", "bar", "baz", go ahead and set the value of the select list item to "foo".
As far as I've been able to discover, there's no built-in way to do this in Application Express. I've looked through the app, the docs, and the forum. If such a method does exist, please let me know.
Otherwise, we end up running additional processes that reissue the query so we can grab the first item as the default value. This seems inefficient to me.
Keeping the LOV query and the "first item" query consistent can present problems as well. We usually end up pushing the LOV query into a function so it can be maintained in a single location, but this seems more like a workaround than anything else.
While the query is probably cached, Application Express has that return value already, right? Why calculate/choose it again?

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