1957 DeSoto 8 3/4"

Here is what we are working on:

First is a 1957 DeSoto that we are finishing up to get her back on the road. Part of that is disc brake conversion front and rear. Right now we are replacing the old leaf springs with new ones from ESPO. Since the rear is out I want to upgrade it and do the disc conversion now. There is nothing available for the stock tapered axle shafts. So can I convert the stock 8 3/4 to a flanged axle shaft? I want to retain the tapered roller bearings. I know the stock rear uses shims to set the end play, so it would have to be converted over to the later threaded adjuster. Does anyone know if this is possible?

I don't want to trow the DeSoto 8 3/4" away so If the above won't work can I shorten the DeSoto 8 3/4" to fit my 1968 Barracuda and install new Moser Axle Ends. I want to use tapered roller bearings and a flanged axle shafts with that set up as well.

Help.