What about the cartridge slot, though? With HENkaku, we have full system control. Cart dumpers gave been confirmed to be possible. I think it would be feasible to have a separate running homebrew actively patching out the normal read/write system and replacing it with a standard SD system.IMHO, if something will EVER get released, it'll look like this: http://img.hexus.net/v2/gaming/screenshots/psp_hd_large_1.jpg (just the flat part)
There's no way to fit a microSD in that slot.