Miandad the first problem is the PS3 is a lot more complex than any andriod device and has plenty of security in place + additional checks. In theory it is possible to write your own gameOS (CFW is nothing more or less than a modded GameOs with some tweaks.)
Well to get dex pup's installed on an Reatil maschine was done before , but it is kind of useless the PS3 checks if you try to use dex features on a retail if it is a dex, the process is kind of complictaed but the IDPS playes a main role here if y want to know more I recommend ps3devwiki.com/wiki/Target_ID.
The last part of your question I don't understand.
By the way graf's work is resumed, just wait and you'll see great things to come, I can't name any dev's here they are undercover after the egohot debacle.