I think that's one way to solve it. Look at your picture and you'll see that the housing isn't in line with the wire within it. That makes the wire bend as it enters the housing, digging into the corner, and possibly forming a kink there.

Eons ago I learned to sail on a 35 ton schooner. Hans, the skipper was a fanatic about fair lead of all the lines because it made them run smoother. His constant drilling about fair lead has served me well and translates well to bikes, You want your cables to have the smoothest, runs with minimum curves and no bends.

Start by holding the housing straight where it leaves the stay and seeing if it helps. If so, you want it to do that on it's own. I don't know your particular bike, but possibly a tighter fitting ferrule, or changing the length of the rear loop will solve the problem.

The wire tie might be the way to go. On my own bike where I did all the braze-ons myself, each stop is a pair, the stop and a guide set about an inch out to ensure smooth runs (Thank you Hans). You should try to think creatively about how to get the loop to take a good line, for instance pulling it down to the micro-adjust screw with a small piece of line.