If you’re interested in Alpa, I’d recommend contacting Steve Hendrix and his colleagues at Capture Integration (
https://captureintegration.com). They are Alpa dealers and very trustworthy. Steve also is a forum member (full disclosure Capture Integration may be a forum sponsor). The new Alpa 12 Plus may also be a suitable option if you’re considering the MAX.
There’s also a lot of tech cam advice that can be found over at getdpi.com
Basically any of the tech cameras (Alpa, Cambo, Arca, linhof, etc) are compatible with just about any back, including the H6D-100c. All you need is an H-mount back adapter in your case. With Alpa, at minimum, you will need an H-mount back adapter, the body, and a lens. Depending on the lens, you also may need a lens adapter, for example a short barrel 17 lens will require a 17mm lens adapter. There are additional accessories you can tack on as well depending upon your needs.
I would try to demo before buying if you can. Each manufacturer has strengths and weaknesses and tech cam choices are particularly subjective. Dealers can definitely help you out here.
The H6D-100c also does not have an integrated power source, so you will need an external power bank as well as a cord to connect the power bank to the back. I’d contact Hasselblad support and see what they recommend and get the power cable from them too, esp in case your back is still under warranty.
-Todd