The kit I bought came with a bracket to hold the PCM down. You could also take a piece of thin sheet metal or whatever you have around, cut it to be about 2" wide by 5" tall. Bend to 90* at the 1" mark, drill a hole in the middle of the first 1" big enough for a self tapping screw. Place next to the PCM, then bend it 90* again over the PCM and secure with your self tapping screw at the bottom. You could also paint the metal, maybe with some underbody coating. Also, removing the bumper cover isn't bad. Take out your splash guards on both front wheel wells, I believe there is a single nut for each side of the bumper cover that when loosened should allow you to slide the bumper cover forward and out.
COTY - 2012
Tom - 03' Bonneville SSEi', 00' Sierra SLE, 1980 Goldwing GL1100 Interstate