The problem with this suggestion goes back to an earlier conversation on this topic - How to match 2+ criteria in the database?
The database is designed to not allow duplicates when more than one field matches an existing entry. This would, in its current state, prohibit the addition of these pending entries to the same table. Approving this entry also implies the removal (or editing / replacement) of the existing entry.
Now, re-engineering that facility to allow for the pending flag is possible, but does extend beyond the immediate question being presented here.
Ken