This seems to be an awkward time to get into z-wave. You are correct that the 700 series controllers are not supported by the z-wave binding. 700 hundred series devices are supported as they are all backward compatible with 500 series controllers; it’s just the 700 controllers that are the issue. However, other reports are starting to come in that 500 series controllers are getting difficult to find (see this recent thread). It’s not clear what the future of z-wave with OH is at the moment. There are some options but none of them are great and the uneven roll-out of Matter just complicates the situation even further.
I know users here have had success with the ZMEEUZB1. I, myself, have used an Aeotect Gen 5+ reliably for several years as have many others on this forum. The Gen 5 also works with a caveat about plugging it into some RPis (again, plenty of info on here about that). I think the Gen 5+ (if you can still get one) has the most reports of easy use, but the take home message here is that as long as it is a 500 series controller and it can connect to whatever you’ve got running OH, you should be fine. They all use the same API for accessing the controller’s function and information so the binding should work.