I’m all for keeping it simple! I’m well aware that my knowledge is lacking in areas but I’m building on it every day. I always thought that RGB and YUV were separate colour spaces (which is appears they are) which is why I was a little confused when YUV wasn’t a source input option on the couple of DCP creation tools I looked at. Especially given that, when I did a bit of reading, a lot of the articles I read said that YUV is the most common and is the broadcast standard.
Anyway, on the ProRes issue, I do have my old Mac machine (I still do my sound design, mixing etc. in Logic) and put the DNxHR through Adobe Media Encoder and there was a distinct loss of saturation and contrast when I did so which put me off going down that route. As for the festival, I completely take your point however, with this one, the festival isn’t actually handling the technical side themselves as the venue has its own staff given it’s history in my city. They actually updated the acceptable formats a few weeks ago adding DCP and a wider frame rate support that they didn’t initially know about so I reckon it can’t hurt to ask them (they’ve said any technical questions are to go directly to the cinema’s team).