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Just swap out that voltage regulator for an LDO with like a .3V or .5V drop and you will be fine.
More specifically, get an LDO with reverse voltage protection built in. (its saved me one two occasions already)
I bought a LDO regulator with RVP built in, however, I thought that this meant that when reverse voltage is applied, the regulator will blow and protect the circuit from a reverse voltage. Does RVP mean that after applying a reverse voltage that the regulator will continue to work?