So for those that are wondering, either the '16-'19 USB hub with 2 USB A that you would get to add CarPlay to a '16 or the new one with a
USB C and a USB A will work with the 3.4 update from the original post.
BUT, if you want the
USB C one make sure to get the one with the rectangular
housing and not the one with the square
housing to fit, they are often listed as the same part number. As of today's date, the rectangular one we need is hard to find, only been seeing the square
housing ones actually in stock anywhere.
Also, I've been running 3.4 19200 non-nav for a while and have had 0 issues, I recommend it to anyone who wants a faster response and more modern appearance.