MoLe,
Why not buy a One-For-All Remote. I am fairly certain that they have a built in code for the HK and that there are discrete commands for it. Rob Crowe's excellent unofficial OFA website
www.hifi-remote.com covers the many undocumented features of the OFA remotes in great detail and how to get into the JP-1 group described below.
As you may know, the JP-1 interface, found in some OFA remotes, allows you to upgrade to devices not in the library or change just about any aspect of the remote with a PC including programming macros.
If your remote can convert Pronto hex then I can generate that or If someone knows how to convert true Protocol, Device, and Commands into a format readable by your remote I can provide those as well.
Jon