I had a similar issue with a plane (SPAD Debonair) I built. With the engine horizontal and a fuel tank in place, I had to bring the throttle wire out on the top right (looking at the firewall from the prop side), but the control lever was on the bottom left. I don't like flex cables.

What I found was that careful bending of music wire allowed me to create a suitable hard linkage. I trial bent up soft wire until I had the right configuration.

The important part was that I found in my first attempt or two, that using 90° bends would not work. It allowed too much flex. Once I kept the bends more in line with the way the thrust was being transmitted, I was able to configure a hard wire with only two bends, each about 135° each. It’s strong and very light, yet flexible in the event of a crash.

jack