Cautionary tale:
A few days ago I tried this procedure on my Cyclone - cut D3, D4, D6, D7 diodes off aux board, attached diodes to 3 (skillshot ball shooter), 4 (boomerang kicker), 7 (backbox knocker) coils. There is no 6A coil in Cyclone. I was extremely careful with removing the aux board diodes and adding diodes to the coils in the correct orientation.

The first few minutes of test, it worked perfectly and I was on cloud nine. Then things started to deteriorate... first the flashers on the 4C circuit started to light constantly... then after a few more minutes and a power cycle, the game now refuses to even boot to attract. So yeah, I kinda killed my machine, and I have no clue what I may have done wrong. I've tried replacing all of the fuses on the power supply and aux boards with no luck.

Side note - I've got 2 other system 11 games, Big Guns and BK2K and both exhibit the same momentary flasher flicker when activating the flippers - so it seems that this is a general behavior for all system 11s - and the flickering didn't start happening until about 6 months after I put in the LEDs.

Follow up on my cautionary tale (issues solved)
the cyclone is alive again, here were the sources of my issues:
1. flashers always-on: shorted transistors Q1 and Q7 on aux driver board, replaced them
2. game not booting to attract: random coincidence that 5V fuse holder came loose, re set it

anyway - everything works perfect now, including the flickering flashers symptom is now gone.