We could always take the Piriform approach and include JavaRa.exe and JavaRa64.exe in the downloaded archive.
Most people will automatically run JavaRa.exe, even if they’re on a x64 system; so the x32 binary would need to detect the OS and call the x64 binary when necessary. This call could be disabled if the user specifies a commandline argument, as it would be assumed such a user would be aware of the implications of calling the wrong binary.
Thoughts?