I guess you could use this in your jgp init:
(I haven't tested it yet, so It may crash FBA. I'll test it a little later)
*edit*
Tested both. They do what they're suppose to, but still doesn't show the logo :|
static void jgp_patch()
{
memcpy(Neo68KROM01+0x100000, Neo68KROM01, 0x100000);
}
or this:
static void jgp_patch()
{
BurnLoadRom(Neo68KROM01+0x100000, 0, 0);
}