has now posted the following update: Ok guys, as Mathieulh
is a lot more familiar with PSP related stories, thanks to him I can tell you now that my little idea won't work.
The reason is, that the Datel technique requires the application to run as UPDATE. The PSP runs the program in update mode which the PS3 won't be able to emulate at all. So sorry, no PSP homebrew on PS3, at least not via this way....