instantaneously - that is not possible.
closest to instantaneously would be to change --dir-cache-time=1000h to --dir-cache-time=1s
tho that would use a lot more api calls and we already know how slow proton drive can be.
there are other workarounds, as i alredy detailed for you in
https://forum.rclone.org/t/load-the-whole-file-tree-of-a-just-mounted-remote/42592/2?u=asdffdsa