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Any chainguide should sort chain retention. I'm still using an old FD but will get something slicker at some point.
Ceramic speed are ~£400 for about 2 watts - definitely better seeing @xavierdisley if your budget is limited. There are cheaper options that will get you most of the benefits of CeramicSpeed - I think the biggest gains are larger jockey wheels, not ceramic bearings.
Waxed chains, dunno, but FrictionFacts site would probably tell you.
I need to find all the aero gains in the world, for next season.
Is there a single ring setup that actually works?
Rear derailleur, those ceramic speed things, worth it?
Which waxed chain is best?
All the gains, so I don’t need to bother training!