I called John in August and he said he didn't have any more early accumulators and it had been a while since someone inquired about them. Soon after, when I found the close universal match that just needed a short pipe extension, I pitched the product idea to him as he sells the early hose as well. I never heard back, so I don't know if he made the product.
Regardless, I still intend to stick with the early accumulator, I just haven't gotten around to making it yet.
If anybody knows a vendor that is still selling the NOS original version, please let me know.