One of our customers did the first test with xhorse vvdi 7935 xt15 chip on a VW Caddy 1997 successfully.
So it could be a cheap alternative to the now expensive original 7935 transponders.
Read Caddy 3D33J immo data with programmer.
Then in VVDI2 software, select Euro->VW-> Immobox- Motorola based
Then load EEPROM dump
Select key postion 2
Make dealer key
Choose chip type PCF7930 (7931, 7935)
Start make key
Prepare dealer key success
The vvdi xt15 key can start engine now.