Most OS2007 "high-level" apps work fine, unless they contain components compiled for the new N800's OMAP CPU. I am using normally OS2007 repositories for the HE, but e.g. N800 version of Maemo Mapper doesn't work in the HE. However, the plugin system for sound over Bluetooth can be quite driver-dependent, and the kernel+drivers in the HE are coming from the OS 2006. So you will have to try...