That’s quite a creative approach, thanks for sharing. 
Just wanted to let you know that the disappearing volume is a WebDAV bug in Finder of macOS High Sierra. It has been fixed by Apple in macOS Mojave. Another “fix” will be the FUSE integration of Cryptomator 1.4.0 that’s currently being worked on. You can get a sneak peek by downloading Cryptomator 1.4.0-beta3 but be aware that it’s not a stable release yet.