+1 here, it seems that when we specify that we use "*" at the last number on the filename to search for a file update version because of the argument it includes for example 0.16."0-armv7" it includes all these characters before the ".AppImage" extension, if x64 is defined or x86_64 after x.xx."x" we can resolve that because the pattern can be corrected after the last number expression.

You could even include a pre-configured ."zsync" file inside the appimage with the update url configured as well for each version be ARM appimage or x86_64 appimage, so it can be automatically added to gear lever