Here is the link @devtanc is referring to:
Post in thread 'T4.1 External USB C Connector'
https://forum.pjrc.com/index.php?threads/t4-1-external-usb-c-connector.65633/post-352506
I've added a post on another thread that was relevant before I found this thread. I solved this issue by creating a board that can be soldered on the bottom of the teensy. Not the right solution for every case, but it worked out really well for...
I know this is a few years later, but just in case it helps anyone who ends up here, I've added a board design that I created to help with this to the link posted by @vjmuzik. Hopefully it helps someone looking for a cleaner solution to this.
I know this is a few years old, but in case anyone wants to do something like this going forward, I have something that may help. As I tried to do this while prototyping I ran into a few times where efforts to swap from one prototype board to...