Never mind... I found a way to do it that 1) avoids messing around
with custom cursors across process boundaries and 2) is likely more
efficient anyway for large numbers of exported records.

Setup:
- Add export flag to table containing potentially exported records

At export time:
- Set export flag to 0 for all records
- Set export flag to 1 for records matching export selection criteria
- SQLite trigger (also added during setup) sets export flag to 2 for
related records
- Export query selects those records with a non-zero export flag

If the user opts to not export related records, I simply skip the
whole updating of the export flag and use the original export
selection criteria in the export query.
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