Using /proc/self/cwd from within an appimage−d application

I'm frequently using /proc/self/cwd as the working directory because I don't like to start an application from a given directory, then having to navigate to the very same directory each time I open a file.

Intended Workflow: cd ~/long∕path/project1/
application&
(press ^O, see all the files)

Unfortunately these applications start to use appimage so this stopped working. Instead I'll have to cope with the applications remembering the in-my-case-wrong directory in the open dialog. I'm not sure how to proceed from this point.