Fri Jun 05, 2020 1:09 pm
The 4B has multiple I2C buses. See /boot/overlays/README for how to enable them.
There are also numerous products available to provide multiple parallel sets of GPIO headers on one Pi.
Lastly, judging by the website for the RaZberry there is an unpopulated set of pins next to the GPIO connector. If those are connected it may be possible to solder on a header and use them. Ask the manufacturer about that.
Attempts to contact me outside of these forums will be ignored unless signed in triplicate, sent in, sent back, queried, lost, found, subjected to public enquiry, lost again, and finally buried in soft peat for three months and recycled as firelighters