For those interested, I found that the RV-10 quadrant has the same panel to subpanel distance as the RV-14, or at least close enough that it was an easy install. So I've obtained and installed the RV-10 throttle quadrant on the panel.
Past comments about the seating position being different and it perhaps not working well in the RV-14 are off base. It appears it'll be a very comfortable way to go, and it is in a great position. Of course, while I have my IO-390 waiting to be installed once the engine mount arrives, I don't have cable lengths at this time, so I'll need to get that later. I don't see that it's going to be any problem to use though. I've got some of the green lower-temp cables that I pulled out of my RV-10 that I can use for routing and measurements, and then I'll order some of the nice black higher-temp cables for the -14.