Here is a suggestion of how to use SS units in Patton's Best. I have not included a way to determine whether or not a unit is SS, but perhaps use a die roll before the day begins if the units you will encounter are SS.
It's been a couple of years since I tried this, but I think it works.
Let me know if you have any questions or comments.
Keep your eyes open for "D-Company - Light Tanks Scenarios in Patton's Best" which I'll upload in a couple of days.