Hi to all, I have a suggestion to overcome the problem of the boot. Since a while I'm working on a port of 4.2.2 of S2 plus through the insertion of missing methods, classes, and even libraries in the framework folder. For now I managed to bring: TwLauncher, AccuweatherWidget, Calculator, JobManager, MusicPlayer and ecc. . The suggestion is to take a rom 4.4.2 aosp or other and insert the file twframework.jar and twframework-res.apk in framework file. I noticed that the twframework does not need to be declared in the boot, but you must enter a touchwiz.xml file in the folder /system/etc/permissions/ . With this system you can install apps of S5 that require TouchWiz library.
I now do not have time to make this attempt, but if someone wants to can try my idea and let me know if it works.