Quoted from MRG:
I'm no electrical engineer but could you do a dongle with a ground wire pig tail coming off it. Then plug/connect into a ground near by?
At some point you're adding more points of failure which cancel out any improvements over the original failure. Revising Node 10 circuit board is really the best way forward. Just like this board being used in Godzilla, I'm sure Stern would like to have a reliable stepper motor controller board in their arsenal for future titles.