I may be wrong,
but
is there not enough travel on the splines for you to slide a one piece prop into the gearbox end and then slide it back to be bolted to the flange on the diff?
(seem to have distant memories of doing this on mk1 and 2 escorts)
But you have to make sure it is short enough when the suspension is fully compressed that it doesn't go solid in gearbox end.
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Failed builder 
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