There are two unused menu magic labels after Ninja that some not too difficult hacking could point to.
Find the exact location in ROM of "Call's" C and set a breakpoint to it in Geiger's (remember you'll have to convert to LoROM). At the break, observe the value of (probably) x. Trace back a few ops to where x is set, and adjust it so that it points to one of the aforementioned unused spaces instead.
I found this all once, but I wasn't looking for it at the time, so like a dummy I didn't document it. Sorry.
If this is still an ongoing issue the next time I have some free time (Sunday?), I can look into it for you guys.