The flaring of the grommet is primarily used to hold the grommet in place while tension is pulled. I am not so sure about how well it will work to protect the grommet from the starting knot.
If I was going to use a starting knot I would use the smallest one the VS Starting knot. When tying any knot it is best you hold tension on the tag end when tensioning. I would highly recommend that with the starting knot. You will be surprised how little it pulls into the grommet that way. Of course when I hold the tag end of the knot I bet you can guess what I use. You may not NEED a starting clamp but they sure do come in handly.
I have the ability to drive people crazy, not sure if I was born with it or I learned it but I'm damn good at it.