Try adding ~/.local/share/flatpak/exports/ (for system flatpaks the path should be /usr/share/flatpak/exports/) to your PATH, then you can autocomplete and start the applications just with their appIDs. Also these launchers, might include some addional default run arguments you did not know about. And you can of course use aliases to make new launcher names that correspond to whatever you feel is right. (e.g. firefox, blender)

Hope this info helps.