Monito, the pearl is too big on the Ndt and gen style wont fit the larger hole.
The WSO might work by replacing the pearl but I haven't seen that one in person.
PMWF has been out of stock a couple years. Classic Watch parts is one I forgot, around 60$..add another 30$ for a pearl. This is why I say gen.
As for a faster solution I have put Ofrei pearls in both cartel and MBW inserts with a fair result.
This is a genuine 5513 insert I bought a couple months ago....nos tritium....150$ shipped.
Deals are out there.