Saw this mentioned in a recent article about an Instragrammer who claims to be the youngest woman to visit every country.
https://www.bloomberg.com/news/articles/2019-11-13/ingenious...
> You can—and should—hold two passports from the same country, simultaneously.
...
> You just need to show written evidence of your conflicting flights, with your name on the reservation. And remember: You can book refundable tickets as proof of travel, show them at the passport office, and then cancel them later. Then you’ll have one handy for any future travel traffic jams.