BicycleRider, I like some of the old stuff too, but be aware that Shimano's hubs all still use cup-and-cone bearings because these last pretty much indefinitely if they're adjusted right, meaning there's some play in them when they're out of the bike, just enough that it just barely disappears when you squeeze the skewer down tight. With rubber seals just inside the dust caps, they keep the dirt out a lot better than the older type also.
Modern external-bearing bottom brackets last far longer than the old loose-bearing ones we had decades ago. (That's not true of the internal-bearing ones though, especially the Isis type.) I have 26,000 miles on my GXP external-bearing BB and it acts and feels like brand new, in spite of a lot of climbing. You mention the "cog set" though. If you mean a cassette, that goes with a freehub body, so you better have the tools to remove and replace that too, because they do go out. For Shimano, it just takes a 10mm allan wrench. If you mean a freewheel, make sure you add the appropriate freewheel remover to your list of tools.
As long as you can at least open them up to inspect them before you leave, and change them if you think there's a possibility they may fail during your journey. "No maintenance required" is fine if you're a day rider and don't have to worry about whether there is a bicycle shop within a few hundred miles.
Most of my ball bearing components have well over 40,000 miles on them. The oldest is the Maillard "Atom" ("Schwinn Approved") front hub, with 80,000 miles on it's shell and cups. The cones and balls have been replaced about three during it's lifetime. All my bearings get cleaned, regreased (waterproof boat trailer wheel bearing grease, no less!) and adjusted at least every 2,500 miles, or whenever I think it might be necessary. I'm not afraid to get my hands a little dirty if it means keeping my machine running at it's best!
And yeah, I meant cassette. Although mine consists of loose spacers and cogs, not a permanet prefabbed construct. All of which were hand picked by me to achieve the exact gearing pattern/spacing I
wanted. My entire bike is designed like that; to suit my needs, strengths, type of riding etc. exactly. or as close as possible (yeah, I know A.R.
Guilty as charged and proud of it!