Induction cooking involves an alternating magnetic field in a coil underneath a smooth glass/pyrex surface. This alternating field induces eddy currents in an iron pot placed on the hob. In turn, these currents (due to Joule heating) cause the pot to directly heat up and the contents within them.
The actual glass/pyrex surface heats up as a result of contact with the hot pot. Often, induction hobs have a fail-safe whereby you can only turn on a heating ring when a pot is placed onto it (unlike a typical electric/gas hob). In this sense, it cannot be heated/kashered at full temperature in the same way that an electric/gas hob can be - the glass surface of an induction hob is indirectly heated by the pot.
Is there a procedure to kasher such a surface for Pesach bearing in mind the Ashkenazi stringency not to kasher glass on Pesach?