Actually there is many more options in that thread you can do without having to buy EZPlayer Pro.
For example, you can edit them in PRV, or use free application like midifilemapper
https://github.com/markheath/midifilemapper/releases The latest release includes few templates for converting EZD to AD, etc but not AD2 to SD3. However, you can create yourself some maps easily (just learn the XML structure in notepad, you'll get the idea how the application works).
Once you create your customized template for AD2 to SD3, you can use it as you like. The application will import MIDI file and export as MIDI file after conversion, means you have to first export your drum track on your AD2 Sonar projects as MIDI file, then import back after conversion.
Hope it helps.