Three-way Google Photos/Immich/NAS mess

Hi all, I am facing a challenging scenario:

As a family of 4 members we have a NAS with all the pictures ever taken, just brutally organized in folders as if each one was an album.
Back when Google Photos storage was free (the original quality for Pixel owners and compressed for everyone else), we decided to upload everything there to have an easily accessible copy on the go (didn't matter if quality was a bit lower).
In doing that, we realized that all the photos taken from older cameras lack the location information and often have the wrong time/date cause the time zone didn't adjust automatically.
So we proceeded to painstakingly fix all of that manually, album by album, over a few months.

Now I would like to leave Google Photos and switch to Immich, but I face this scenario:
  • on my NAS, I have the uncompressed pictures with the wrong metadata
  • on Google Photos, I have the compressed pictures with the correct metadata
And, of course, I would like to have Immich populated with uncompressed pictures with the correct metadata.

This, on top of the existing issues with migrating shared albums from Google Photos to Immich (I read the thread related to that, and it makes me wanna cry), really deters me from even attempting this.

Am I missing something obvious that would greatly simplify all of this?
Should I just wait cause future Immich development is going to simplify such situations?
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