The ones I have seen locally used a QD bushing type SD. The large end of the taper for that bushing is 2.187 thus not nearly as much material must be removed as compared to a standard taperlock. So far as. I know it was very successful.
Would you please have a part number for that item, and a link to a supplier
Here is another thought to consider. What if a metric version of this item QD bushing (50 mm I/D) was used? This would then allow a damaged crankshaft to also be reclaimed at the same time (a minor benefit would also be that the subsequent machining of the crankshaft would remove any light rust pitting and give it an as new appearance on the exposed surfaces). Granted a modified starting handle would also be needed, to suit the now 50 mm diameter shaft
Then taking it a step further, the above modification would also then allow under-size regrinds on the main bearing journals, granted replacement sealing rings would also be required.
This would allow the original crankshaft to be retained