Chris,

Why didn't you say so??? I bet you could just fill all your unused
memory locations with NOP, then at the last location, just put a
LJMP somewhere...? Or, Designate a location ... like
0x0400 and fill your code with LJMP 0400,
Codes 00 = NOP
04 = INC A
Both are single byte op codes that will not have you uP go crazy!

Good Luck.
Josh