Throttle cable

The factory stuff is quality. I just think it's going to waste a lot of your time trying to find the correct combination. If you need something to work in a tight space, I would look at the early A body setup. That takes up about the smallest footprint there is regarding the kickdown linkage and should be easily modified to work with what you have. It uses two separate bellcranks instead of the one piece long rod that takes up a lot of real estate. I think that would work for you. Problem is going to be finding it.
Can you use the lokar kickdown without using their throttle cable too? From the looks of their bracket it will be hard to.