Getting the coupling loose from the shaft is a bigger issue. The coupling is steel and will corrode internally, making it difficult to remove. There is a technique you can try if you want to go that way.
This involves putting a spacer between the prop shaft and the engine shaft (a suitably sized socket?). You then put 3 long bolts with nuts threaded on all the way through the coupling and into the transmission flange. By holding the bolts from turning and tightening the nuts against the coupling, you pull the coupling forward, leaving the shaft aft. Oh yeah, remove the set screw first.
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