Ps2 Phat Usb Hard Drive PS2 Permanent Softmod?

PS2 Permanent softmod? - ps2 phat usb hard drive

Is it possible to continue permanently Softmod a PS2 (phat), without a modchip or SwapMagic? I do not want to make changes in my PS2, as the tool to slide or flip something like the PS1 had.

I try to launch my games from USB hard drive, and I found that USBeXtreme could help it, but there is a way to permanently allow me to play to the ability of a non-USB hard drive without the drawbacks?