maybe something like this (all over the table), since you are RET'ing:

LJMP IGNOR ; swt=0 no operation
AJMP DIPSWT_mode

you'll have to recalculate the pointers

and this eventually should overflow:

IGNOR:
NOP
ACALL DIPSWT_MODE

AJMP, instead of ACALL

but wait for the experts... I'm almost sleeping :-)