For the failed drives, you could try getting the exact same model of drive and swapping the logic boards. The damage may be confined to the logic board, and the data may still be accessible.
Just wanted to note that this is a tricky match up. Not only do you need the same make/model drive, but you also need the same Rev and Firmware version! If the chips are as cooked as I am visualizing through the description, the Rev and Firmware version of that drive may be unable to be verified.
I attempted the same swap in the past between 2 drives and it didnt work until I found an (exact match) which was same Rev, and Same Firmware label version. I was able to find one on ebay for $20 that ended up working, but the other drive I had on site of a newer rev but same make/model drive would not work. It came up as an unpartitioned drive at which point I quickly shut it down to avoid anything getting written to the platters. Confirming with the ebay merchant that the drive in the pictured auction was in fact a match to be used as a board donor was the only thing that worked!
BUT this also does not guarantee that it will help your situation as for your drive may have gotten well beyond 12VDC to the motor that spins the platters in which if that is the case you add a donor board to the drive and it wont spin up
If this is the case then only method of data recovery is sending it out and paying for data recovery which can be quite costly.
I have attempted to move platters of a drive which no longer spins into a same make/model and firmware/rev version drive making sure that they are installed in the same orientation with 2 drives that I no longer cared about, but still worked, and what looked like perfectly matched 0 degrees of rotation out from each other with total failure. So its best to have a data recovery center do their magic on drives that no longer spin. It was a wasted 8 hr long project! But I suppose a learning experience that even being as careful as can be to not fingerprint by wearing nitrile gloves or damage the platters in any other way, keep the same platter position by marking both platters outter unused for data edge scored with a razor blade and straight edge and magnifying glass to pair them back up in the same position to one another confirmed by using straight edge to line up the score marks exactly and then lock the platter retaining hub locks down. I also paid attention to not flipping the platters during the swap process. Initially I thought that maybe it was a failure of the donor drive to read the data, so I attempted to put the platters back into the original drive with extreme attention to detail verifying that everything was as perfect as it could be, including the heads that read/write to the platters that they were properly set. BTW: Moving the heads out of the way on the armature is a royal pain and a small torx set had to be purchased to unlock the platters from the retaining hubs.
Out of curiosity, after the drive was back together and unable to read the file system that was on the platters, I was able to repartition the drive and format it and write a text file to the drive and read the test file off the drive, so I can only assume that the rotation of the platters even though as close to the eye as can be, was offset by a fraction of a degree making the data unable to be read.