After talking with Rex today, we figured out that the wires to 3/4 were from a manual switch to a cruise/climb.
We decided to move that function to 7/8 in parallel with the OAT per design.
Using 3/4 and 5/6 as designed and verifying the profile upgrade, I was able to get GEAR and SPOILER presentations as designed.
This CN installation was accomplished in Slovenia where the glider was built and the installers undoubtedly got C/C to work and didn't worry about following any nominal procedures.