Yes-----Kerabond mixed with Keralastic will work----I believe that some better modified thin set can be used over cutback---call the technical help line for the brand you have available---
If leveling is needed---Jifset mixed with Linewebers liquid latex is approved for that---
DO NOT use any solvents in an attempt to remove the cut back---it will soak into the slab and become a 'bond breaker' and put your installation at risk----Just use a razor scraper and start tiling.