I love Curve cards but as far as I know they only offer full sized cards tho so normal conversion might not work. Maybe a com conversion could work but as far as I know it’s currently in testing stage with @Satur9 although it’s not curve card it’s testing I believe.
I think it might be possible if the chip has a relatively standard capacitance but you’ll have to ask Amal.
What does TagInfo say? If you have an LCR meter, you might be able to sacrifice a card and mesure the antenna inductance but you must be very careful, doing this wrong could give you false hope, and you will probably have to get a new card to get converted.
Personally or one option at least:-
I would ask your friend for theirs when it expires, TagInfo dump it, record antenna capacitance
Throw it in a glass of acetone and see what the insides look like ( Or shine a bright light from behind )
Share you discoveries here
Basically he (satur9) is / has been testing the viability of conversions with The Visble chip on a Chip and Pin card
TagInfo is made by NXP, it is pretty good at recognising most chips (better than NFC Tools, but not as good as a Proxmark)
If the Curve used a NXP chip rather than Infeneon, we may have got a capacitance (a look up not a measure)
like this one of my Spark
The curve card is not a real tokenizable cards because it expires after 4 years… it is not very different to a Laks wearable (walletmor implant) which expires itself. The curve one seems to be one of the classic attempt to sell some revolutionary product when it is clear also for me that it is not comparable to real tokenizable cards. At this time the only way on the market to have a real tokenizable card would be partnering/working with Fidesmo (Fidesmo Pay is the only real tokenization service for NFC Smartcard eSE devices) or VivoKey itself.