IMO it depends on how long of a tour you're planning.
If it's just a week, and the current components are actually in good shape and unlikely to break in the next 300-500 miles, I think you'd be OK.
If it's longer than that, I'd be a bit concerned about wear to the drivetrain. I'm not much of a mechanic, so in that case I'd take it to a shop and get an estimate for replacing anything that looks worn down & have them check the wheels and hubs. (I'd expect the wheels and hubs to be fine though.)
As to bars, you could just get Ergon grips with bar-ends.