So these chips can bake pretty random numbers right? Then why on earth should I use a USB TRNG dongle like all those boring, implantless people? 
It turns out using an Apex or a Flex One as your RNG is pretty simple: you just need to install the pgp applet and let gpg and scdaemon do the heavylifting: use my implanted smartcard as a TRNG · GitHub
Here’s a short, messy clip of me getting 32 random bytes out of my arm:
