Compile KIO with this patch.
Build KIOFuse (follow instructions in README): https://invent.kde.org/kde/kio-fuse
Once KIO is built, Dolphin is built with this newly built KIO, and kio-fuse is built,
one should start the kio-fuse process.
The easiest way to test this is via Dolphin (that is built with this patch).
Once you have done the above one can simply browse to any non-local location in
say, Dolphin, where upon opening a URL in a non-KIO enabled app, it should open
in the KIOFuse mount, except for MTP/Gdrive URLs - those will use KIOExec.
Conversely, KIO URLs in KIO-enabled apps should not use KIOFuse.