TF 727 Push-button Output Hub Converting to U-Joints

I'm not too familiar with 727s with flanges but don't some of the later bolt-on yokes like used in trucks and motorhomes shorty 727 have the same spline? If so, those might be easier to work with for what you are doing.
Thanks. I already looked into the RV flange, but unfortunately the splines are much finer than the 1963 - (some) 1965. I didn't go further in seeing if the shaft OD and the flange OD where it rides on the seal are the same OD, but they look larger. It would have been a slick swap if everything was the same.