The problem with all of this is while the Commodore 64 mini might be using an ARM CPU for expiation, a basic end-user using the device will only be able to use an external keyboard to use this device as a Commodore 64 BASIC machine and that’s it.
This is utterly not a general purpose computing device because anyone who would buy this device in 2018 would not be using it for daily computing tasks but rather—let’s face it—play games. Many of the games are baked into the device and the “built in keyboard” is a decorative miniature at best.
The fact that all of this sits on top of an A20 chip is irrelevant. If this question were “How can I modify the Commodore 64 mini to run a modern Linux OS?” then to me that is on-topic even if it is an extreme edge case.
But for most users of BASIC on this device the CPU is utterly meaningless. Which is why I clearly stated in comments on the original question it would be better suited for the Retrocomputing Stack Exchange. This is a nostalgic device at best.