Stop in for a cup of coffee

so I am thinking of going back for the ball and trunion 4 speed for the valiant....I have been hearing from rock crawlers and 4WD that it wouldn't be much to make a custom driveshaft with a slip yoke towards one side to bolt up to the flange but eliminate the ball and trunion which is nearly impossible to find parts for. The ideas they have use readily available parts available from summit