No, actually the problem was solved for the Jenny, but the bell crank is partly visible. Keep in mind, in this case, the pull test is 50lbs, so there is a big load to deal with.
The real problem is for future aircraft, TBD, where the issues are likely different. The loads must be routed into the structure in a way that can be accomodated and still give smooth, bind-free control, etc. The point is that there are more approaches out there than linkages and pulleys. And yes, for the Jenny, I did think about turning the corner with pulleys and attaching the leadouts to the scale elevator cross bar, but pulleys large enough to give smooth control are a worse problem than the bell crank to hide. The pulleys have to take the pull test loads as well as the control anchor point. The result for what I did do is a compromise, but in sport scale the cockpit interior is not judged, I just want it to look scale for my own satisfaction.
For a precision scale project, the requirements are more stringent and the interior appearance is important. The flying wire attachment and the control actuation need not be linked, so perhaps there are two easier problems rather than one difficult one.
John