Really not an informative video, so I'll explain.
What you see is the C64 running a simple BASIC program (peeking at $8000), and my workstation getting logs from the C64 of the current value from the data bus. The next step is now to change that value as it's being accessed, so that I can feed the C64 with uploaded software.
As you can see, the bluetooth is working fine (currently at a modest 9600, can be cranked up to 115200 without problems), and the MCU interacts nicely at 12MHz. The current mockup program is written in C, I will rewrite everything to assembly when I start manipulating the data bus.