Now I optimized the package a little bit, removed some patches and files which are not needed and using MACHINE_FEATURE kernel26-legacy instead of DREAMBOX_KERNEL_VERSION.
If it is still not intended to add it to GIT I will just keep it on my local GIT clone and see how it works with "new stuff in future".
By the way: Thank you all for working on OpenPLi, without your work the diversity of E2 STBs would not be possible like it is.