I am supporting Jim
Even if your work-arounds work, you are asking for trouble as DxO files the record of processing (.dop file) in the folder where the image originally came; if you change it, you lose the record.
From the fact you use a folder called "pictures" suggests you come from PC world. On a mac you don't need home folder, nor pre-ordained folders. (unless you are one of several users, another of whom could mess up)
So the sooner you break your images into managable folders of, I suggest 500 (nefs of 16MB in my case) with dated reference system eg on my n1v3-1502-0000-0500, the sooner you will make life easy.
DxO allows several Duplicate (alisases) processings of each image, all next to each other in source folder
For files converted to .tif, jpg etc, I suggest you use other software, the easy mac one being GraphicConverter. I keep converted images there under my own cataloguing system, but ALWAYS RETAINING the number that came from the camera, whatever I add before or after it. Mac Finder finds all variants.
That arrangement makes it easy to look out an image you know you have in your system and return to original for re-edit AND printing. Mac Finder is a database, you don't need other ones.
Unless you do a lot of further post-processing after DxO, which I personally rarely find necessary, you get as good prints as printer allows from original RAW, unconverted, in DxO