How would I remove voicememos from my iPhone while keeping them somewhere else with the metadata?

How would I best archive Voice Memos from my iPhone 8 Plus to free up its storage, probably to an HDD through Windows? There are many guides online on how to do similar things, but they mostly seem like promotional guff. Metadata MUST be preserved.

I have previously submitted a version of this to the Reddit communities r/iphonehelp , r/techsupport , and r/applehelp on March 18/19; r/DataHoarder on March 15; and in an earlier stage r/iphonehelp and r/applehelp again on February 23 and 29, respectively. So, I'm rather sick of not getting good answers. I am also submitting this to Quora at this time.

So, here's the deal:

1. I like documenting events. I really like documenting events. Sometimes I record hours of audio over the course of a day, usually using the Voice Memos app on my 64 GB iPhone 8 Pro. (Yes, I know it's old, but I'm not exactly swimming in cash now...)
2. For whatever reason, while iCloud allows the off-loading of many file types (e.g. most information in Photos, Messages attachments, webarchives, et cetera), it doesn't appear to allow that for Voice Memos. All iCloud is doing, seemingly, is mirroring them... which to be perfectly honest, rather limits its utility with Voice Memos, as while it may protect against file loss in case your phone is lost or destroyed, it doesn't protect against a malicious (or stupid) actor acquiring your phone and deleting them.
3. As it turns out, hundreds of hours of audio recordings take up a very significant fraction of 64 GB. (Note: Actually they take up 85.18 GB somehow, which may prove a complication—either the program is capable of some {albeit ineffective} offloading or many of my earlier recordings are gone.)
4. As mentioned earlier I ran into the storage wall first on February 23, but enabling of message offloading, periodic iCloud offloading of new pictures and other content, strategic offloading of apps, and garbage collection allowed me to continue until Pi Day.
5. On March 14, I basically ran out of apps to uninstall. With full storage and a skeleton crew of apps, my phone is now effectively a dumbphone.
6. What do you mean DELETE ?!
7. I need some way to back them up so I still have them while I can free up my phone's storage space so I can actually continue to use my phone.
8. Google yields results. So, so many results... I am overwhelmed, and am not sure what the best avenue is to take.

With doing this, I am concerned about 4 aspects, ranked in rough order of the product of importance and possibility:

1. Data integrity/Quality. I don't want a lossy transfer, especially because I have been recording as lossless since the beginning of this year.
2. Metadata integrity. Often, file transfer results in changes to the file's metadata, particularly the timestamps. The prevention of this is non-negotiable.
3. Backportability. Ideally, I'd like to be able to somehow import the recordings back into the Voice Memos app, but I have a feeling that's a pipe dream.
4. iCloud remanence. Ideally, I'd like the files to remain in iCloud as a (further) backup, but I have a feeling that's a (bit less of a) pipe dream. I also fear that if that is the case, it will try to re-download the data to my phone after I purge it.

I tried "[Saving] it to Files" on my iCloud and then deleting the original Voice Memo, which ""worked"", but didn't preserve the timestamp as to when it was recorded but the timestamp at when it was uploaded as if that was somehow more useful information, which meant it was a failure. Archival is dependent on recording and retaining context—removed from their surrounding place (recorded in the titles) or time, these recordings mean close to nil.

[Re-Titled by Moderator]