Third Party Cartridge Services that Retip, Refurbish, Bespoke Rebuild, as outlined by @needlestein, can offer to a Customer an increase in options on how the Cartridge being offered for a work to be undertaken, can be returned as a functioning design.
As suggested in the past, a Manufacturer in many cases, is most likely to restrict their work to using equivalent parts when receiving a Cart' that needs new parts to achieve the Refurb. Parts used at the time of Manufacture are potentially no longer stock items.
With the above being a most likely outcome, I can't see any reason not to speak with a Third Party Service and draw on their experience of available materials and works undertaken on Cart's to discover if a Cart' can be offered that seemingly will be an attractive prospect to ones own preferences.
I was assured an Ogura Styli / Beryllium Armature (not used on any of the Cart' Brands Products) along with an upgraded internal Damper, etc, (used by the Cart' Brand) would be a worthwhile combination to get the Sound I was describing from a Cart' I was offering as a Donor Model. I have never shown a disappointment, I have only been thoroughly impressed with the Technicians work and this rebuild. I often wonder if it can be maintained when the time comes.