Debian Buster XFCE: make PCManFM default, including for Open a Directory, as in Chromium - downloads - show in folder

Using Debian Buster XFCE. XFCE is married to Thunar, so cannot remove thunar. I would prefer Chromium (or any other app that might choose to open a directory), as when viewing Downloads and clicking 'show in folder', that PCManFM be used to open the folder. Have already: - Set default File Manager in 'Preferred Applications'. - Created a pcmanfm.desktop in ~/.local/share/applications - Edited mimeapps.list in ~/.local/share/applications/ (also ~/.config/) - Did xdg-mime default pcmanfm.desktop inode/directory and confirmed output of xdg-mime query default inode/directory.