First of all, I didn't do it, I know the consequences.

With that out of the way, I believe a translator regeneration would be possible without data loss. The steps would be as follow:

1. Read sysfile 348
2. Parse it (new PC3000 plugin) and save the Extents map
3. Regenerate translator
4. Read 348 again
5. Import extents map
6. Rewrite 348

This theory is based on another strategy where you initialize the MCMT by C>U10, and then import the extents into the new sysfile

Anyway, I'm thinking about trying this out on a test disk (not a clients one for obvious reasons), but I'd like your guys' input as well

I think the valid question is why translator regeneration is required in first place ?

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Data Recovery Pakistan

There are cases where you con recover access to the user area by regenerating the translator. I am aware this means you lose the Media Cache, but at my company we've had several cases where our last resort was m0,6,2,,,,,22, and by some miracle, after rewriting the original translator, you get full user access.
I've been reading a lot about seagate drives lately, Rosewoods specifically, and I thought of the above method that might keep the Media Cache intact, but before trying it I would like some input.

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Will recover data for food

WOW
seriously?
there are cases you can recover the data with an HSA replacement
and there are cases you have to clean the pletters
so what

looks to me that you've gathered a to do list of solutions that helped to recover data ever
good luck gambling with someone else's data

I have seen many Rosewood Drives, with different problems but trust me we always extract data without regenerating translators on these drives, many Gurus here will agree, they are work around to deal with it even if translator is corrupt but never with m0,6,2xxxxx commands.

if you have such a case, share terminal log here...

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Data Recovery Pakistan

not all cases Required Translator Regeneration yes some cases it required its depend on Drive condition,

if you share Terminal Log that would be helpful to understand better .....

always take backup of Critical system files first then work on Rosewood.

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Specialized in Physical Data Recovery

https://lifeguarddatarecovery.com

Translator regeneration can help in some situations.
Incorrect translator regeneration will not help and can cause data loss....