I hope it works for you, but I suspect they wont be able to get the batteries, though there may be some in the supply chain somewhere. I'll check them out.
The $300 plus batteries are the ones still made by antique auto battery, which have universally BAD reviews.
The only show I now take my car to is the Florida Mopar Nats and that is 2 weeks from today, so if I cant find a decent replacement, I may try the "gut case install odyssey battery" route next weekend.
If I go that route I will take lots of pictures.
I understand its a messy job and takes lots of patience not to break the case.