This is doable, yes, and I have done it myself while travelling. The trick here is to employ FileVault. FileVault password prompts appear when the machine has gone to standby or hibernation. Turn off all prompting inside OS X, and set up FileVault. Then adjust your energy preferences using System Preferences to never go to sleep, and set your hibernation mode to hibernate using the command line and pmset tool. Alternatively, using the same tool, set the standby delay to something low enough that it will kick in, but high enough that your Mac can sleep safely. I prefer the first option, even though it does mean it takes longer to sleep and wake from hibernation. Be aware that doing this also kills any feature that depends on sleep, for example network availability or PowerNap.
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