Good morning Simon,
Hauptwerk is not compatible (see supported platform - https://www.hauptwerk.com/wp-content/uploads/2020/03/HauptwerkPrerequisites.pdf) and can't be run on an iPAD. Maybe one day, since future MAC (2021-22) will use ARM processor like the IPAD. But for now we don't know if Hauptwerk will be available on the new MAC platform or when it will be (just to early to answer those questions).
You can read our chief developer' answer here