SDA and SCL on core shield shield

I got the RGB LED Lighting Shield with XMC1202 for Arduino from infineon and it works with an Arduino Uno as an I2C slave.
This is the layout of the shield with the pins in use:
Just ground, power and SDA and SCL.
Then I got myself the core shield shield and very soon I noticed the two missing pins, SDA and SCL.
I have seen this issue and noticed that the new Photon shield shield carries these pins.

However this does not help me.
What options do I have to get SDA and SCL connected on the old shield shield?