Most jibs can be converted to self tackers just by changing the tack plate
I suspect that the standard Taipan 4.9 jib sail will be hard to modify to a selftacking jib by recutting. I fear you will indeed need to buy a new jib sail to get it right. The overlap of the old jib is just too much. If you try recutting that I think you will run into trouble with the draft that is induced by the seams.
Wouter
