Are you planning on a DIY job or having it done professionally... DIY you'll need to drill and tap for the screws and use permanent loctite. I had to re-do one in the past when the banded front fell off... I have them "welded on" now... works like a champ and the bases aren't going anywhere.
I've drilled and tapped about 100 barrels for sights and never used ANY loctite much less Permanent. Never had any sight come loose. Welding the banded sight on, really? Soldered a ton, never had any of those come loose either. That said, when soldering, some do a better job than others.
Any barrel can have sights added. Thin barrels can be trickier to drill and tap so soldering is often a better solution. Something to think of, skinny barrels will require a taller front sight.
As for barrels, I always recommended folks go with a faster twist than they anticipate needing. Why, well, even if you don't plan on shooting heavy for caliber bullets, monometal types are longer for weight than their lead core counterparts. As more states adopt lead free bullets regs, the need for a faster twist becomes more real.