TL;DR
It's an interesting idea, but trying to sell it to Mac users specifically is probably fairly misguided.
Ultimately, it'll probably be easier to develop it for the Pi, you're likely to get more people interested in donating to that cause, and the OS and its goals honestly sound better suited to hardware like the Pi, or even high end developer hardware like one of the nVidia development boards (Kayla, Jetson TK1, Jetson TX1) than to Mac hardware.
It's an interesting idea, but trying to sell it to Mac users specifically is probably fairly misguided.
Ultimately, it'll probably be easier to develop it for the Pi, you're likely to get more people interested in donating to that cause, and the OS and its goals honestly sound better suited to hardware like the Pi, or even high end developer hardware like one of the nVidia development boards (Kayla, Jetson TK1, Jetson TX1) than to Mac hardware.