@analogkid:
There actually is a GVPPatch utility, check
this link (just search for "GVPPatch").
As far as I know, up to version 1.7 was released and existed in the biz/patch directory as GVPPatch17.lha on Aminet, but for some wierd reason it is missing nowadays. Anyhow, you can find v1.5 and and a rather good readme describing it on
this disk. You can also find v1.6 on
this disk. As you have a GuruROM it shouldn't help, but there is no harm in giving it a shot

.
/Patrik