Thunderboard with Arduino MKR (SAMD21) and I2C library

Please pardon any ignorance displayed below and tactfully steer me towards an appropriate resource.

Has anyone been able to use the Thuderboard with an Arduino MKR series board (such as the WIFI 1000 or 1010) that use the SAMD21 chip? 

The library from switchdoc uses the Wayne Truchsess I2C library ca 2012. I am unable to get this to compile for the MKR board.

This appears to be at least in part because the I2C library used by the official Thunderboard library uses the direct port manipulation techniques described here: www.arduino.cc/en/Reference/PortManipulation

This technique is specific to the ATmega chip on the older Arduino board, such as the Uno. 

I would expect that, in order to get the Thunderboard library to work with the MKR boards, one would have to either:
1. Modify the Thunderboard library to use the standard Wire library (which I presume is not possible due to some sort of limitation of the Wire library), OR
2. Modify I2C library to work with the SAMD21.

Both of the above are beyond my skill set. 

Has anyone else successfully used the Thunderboard with a SAMD21-based Arduino? 

Thanks in advance.