In order to have different hard buttons per page, you have to split your pages into multiple activities/devices as the Firm/Hard key definitions are available only at the Device/Activity level.

One thing you may lose by doing this is the ability to use the Page Up/Down buttons on the side of the remote as I can't recall if you can program these with different commands like you can on the Pro Remotes. What you end up having to do is to 'wire' your pages together using onscreen buttons that do Jumps to specific pages.