You said someone made a TW launcher become universal???
Would that be possible to be done with apps like Sammy Music Player???
Depends on what Samsung do on their apps. Some apps are weird (easy to the port), some apps are strong (hard to port/develop) and it's all about their framework and bla bla blas. You can see some development threads, they're trying some apps to port from Samsung
but full working stuff not exists, almost they're all buggy. Even if they not buggy, the apps requiring 4.2/4.3 or above.
So research, work, try and let us see
Edit: and the thread that I said ;
Note III Launcher