As I wrote this is not a recommendation to do it so, nor a DIY instruction, etc...!
This is just a proof of, is it possible for someone? It could...

If you want to try it by your own, I would recommend to get some of the SSD of exactly same model/type
and try it with them, so it doesn't matter. Also get the right! tools for doing this (osci, logic analyser, SMD stuff, etc.. - not that expensive)

There is no pressure to do anything with the original SDD!?! the information is stored there for years, if it's there (wallet.dat) where is the problem?

In any case, I'd try to get a copy/backup of the NANDs, because there are the data on.
(this should be only done by someone how is 100% in knowledge what he's doing!)

If you have a copy you could also try to make a 1:1 copy, where I wrote not possibel because of encryption, but the software (firmeware updater) etc...
maybe it's possible with the orginal tool from Sandforce? (try it only on demo SSD or copied SSD, not orignal!!)

Bye,