Yes to a ring inside, FAR superior to any other brazing method I know.
Wind rings around a mandrel. Trial-and-error to get the mandrel size just right, due to spring-back. You want the rings just a skosh too big, so they spring down to fit in. That leaves them pressing tightly against the inside wall of the blade, so they don't move around, and best heat transfer = fastest melting once you're up to temperature.

A couple winds of smaller wire is better than a single wind of larger, but I don't know where to get brazing rod smaller than 1/16". That's small enough. Hank Folson supplied "springs" made of really fine wire, and those were great, but I've never made them that way myself.

Just hold them at brazing temperature a bit longer to ensure filler flows everywhere.

You could also ask Richard, tho I expect he'll say the same.