It is possible but I think it is currently broken / unfinished / does not work (properly) yet.

I seem to remember at one point thinking that U-Boot could be installed into the SPI on the a5e and then I could choose the boot order. Is that possible or did I just dream it? If it is, how do I install U-Boot into the SPI? Is there one specifically for the a5e?

does any has vpu supported image for radxa cubie a7z

radxa cubie a7z has capable hardware accelation VPU Cedrus but not implemented in kernel

Could you please explain how to install wine-proton? I've been out of it for a while and don't remember a thing. I'll add it to armbian-gaming when I can make it work. And make a video about the process.