In regard to your question, the ISRT is actually not compatible with Series 6/C200 chipset, as you mentioned before, and as you can confirm on the following link:
So, at this point, the IRST will not be able to work with your system.
I checked for a possible workaround in order to make it work, but there is no documentation or procedure in order to do that.
Let me apologize for any inconvenience.
Any questions please let me know.