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Not a bad idea. Lets do the math though. The alternator's max output is about 15V. We have to drop 15V down to 13.2V. That would take three .7V drop diodes which would create a 2.1V drop. But, lets say I'm now running on the battery. The lowest my battery voltage to the dc-dc converter can be is 10.8V. With the diodes in place, that means my battery voltage can't drop below 12.9V. If it does, the dc-dc converter won't work anymore. 12.9V is higher than the resting voltage of a 12V lead acid battery, let alone a loaded one. So that unfortunately won't work.
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