No, I don't think they're sufficient, safety wise. Your body could easily obscure the view of the signals from drivers behind you, and they might not even notice them if they could see them because it's not where they'd expect them to be.
As far as wiring them in, just run the wires through the bars along with the switch pod wires, unless the 650 wires are run outside of the bars in stock form, which now that I think about it, they might be. If there's a slug in the end of your bars, then you'd have to drill through it to run the wires, but that might not be too easy considering the thickness of some bar end slugs.