What's involved in recovering the data if the controller fails?
hot-air rework to lift all the flash chips off and get them hooked up to something (probably custom) that can read them.
if the controller was encrypting everything that went to flash, you also get to try and find the key in the controller's memory.
your data is probably jumbled up one way or the other, but at least a custom board will let you read all of the underlying flash, instead of just the portions of it that a new controller would believe are in use. (keep in mind that the SSDs will have more physical blocks than they advertise logically.)