changing the icon of an already converted psx eboot

hi is there any program that let's me change the icon and other things of an ALREADY converted psx eboot?
I already have a savedata so it might be hard to apply same changes to the save data.No I do not want to unpack it then repack cuz it will take too long.
anything that involves unpacking or ripping out data off the eboot is something i don't wanna get.
and i don't wanna re convert it all over again