Yes it's overkill, but you already knew that :-)
Invest your sanitation on your fermenter.
Such extreme measures are especially pointless for your bottles for a few reasons: 1) at bottling time your beer already has alcohol which provides resistance to baddies. 2) your beer is already fermented so there is much less food for baddies. 3) you have a large amount of viable competitive yeast that will out number and hopefully out compete baddies. 4) if baddies were to take hold they would only ruin individual contaminated bottles rather than the whole batch.