I'm happy with holocam - you know what it is and it doesn't draw attention to itself. But it does sound quite like something out of Star Trek.

I don't like 'electric scribe' or 'memory keeper' as names in English - they sound contrived. But an alien name (like 'ahnkat') which is explained as meaning, say, 'electric scribe', would be good. The question is perhaps whether you want to have a word that your readers won't necessary recognize, and whether you can get your characters to explain their culture without it sounding forced.

Sorry, that was a bit waffly. And just my tuppence worth, of course . . .