Putting aside the UCS Hardware, which should be reviewed and perhaps upgraded, I do see Migration SKUs in Netformx for Migrating from BE UWL to CUWL-STD or PRO.
For release 8.6 it would be top level CUWL-LIC-STD-K9
Under that: UWL-MIG-CUWLBE-STD $10
For release 8.6 it would be top level CUWL-LIC-PRO-K9
Under that: UWL-MIG-CUWLBE-PRO $220
I see similar SKUs in release 9.0 under L-CUWL-ADDON-xxxxx
Since BE-CUWL is $315 and CUWL-STD is $325, I guess it makes sense,
Same for the jump to CUWL-Pro.