So I ran the update (non NAV) with no hiccups this morning and just replaced the hub, and I now have USB fast charging on my Pixel! I also think the 3.4 interface looks a lot cleaner than the old one.
It also kept all my Forscan changes through the update (boot logo, Sirius delete). It also finally enabled climate control on screen. I had turned everything on in Forscan years ago but for some reason it never worked, and now it does.
I did have to re-pair my phone with Android Auto, both after the update, and again after replacing the USB module.
So far so good, if I run into issues I'll be sure to post them.
This is the module I purchased that fits.
https://www.amazon.com/dp/B082S7FL7G/ref=cm_sw_r_fm_apa_i_WMArEb8X7WHBK