Not that I know from firsthand experience but when I was buying my HUD Bruce Partridge mentioned he was heading to Kona to dive with Konaquatica.
Konaquatica Dive Center
I wasn't aware of them prior to his mention of them but they're now on my radar. Now it's just a matter of getting the time/$ to make it back to Hawaii. He said they're a full service Rebreather shop so tanks and sorb are available.