I discovered ratarmount the other day (pip3 install ratarmount), which fuse-mounts tgz. Fancier, you can glob all your Takeouts into a single merged directory (ratarmount *.tgz ~/takeout). Even fancier, PhotoStructure will then read and de-dupe that directory hierarchy. I just added person and album metadata parsers (those will be in the next release), which were the last bits that we're missing.