I want to suggest something extremely controversial. @siracusa should try a base model (or near base model) Mac Mini at least for a few months. To acknowledge up front, he would be miserable and need external storage for more than just his photo library. However, it would make for great content and I think it would be much more usable than he thinks. If Quinn Nelson can use a Neo, John could survive on a Mini.
I suggest this not just to torture John. I suspect the speed difference from his Intel Mac Pro would be an appreciable improvement and the use of swap would not be an issue, even for him.
@TheCodeLorax I’m sure it would be fine (other than the storage space hassles). But that’s no way to live!
I have another suggestion: Apple should send me a highest-possible-spec M5 Ultra Mac Studio so I can see what I’m missing!