The problem I have with cutting the piece and gluing it back on is that it does not last that long. Here is a picture of the one on my dad's truck, he has to reglue it about 2 years for it to stay together, and as you can see it is about due for a gluing.
So I think the best option for me would be to take the column apart and add the grommet. I also forgot to add that I want to do this with the column in the truck, does that change the instructions that you gave me before?