The JCC boys should help you in this.
Their trims are constantly being refitted or replaced.
Suggest PM Racer or Speedster.
From what I have seen they are just held on with a series of nylon pin buttons.
Similar to those for fitting interior door linings.
Trims should just pull off with a bit of effort.
You may have to replace the pins though as can be damaged on removal unless lucky..
They are mostly held on by plastic pins yes. They break easily but can be had for cheap (along with the trim) from your dealer. But many also have one screw holding them on...check the back side of what you are removing (inside the hood for example) for a nut to unscrew. Then pull off till each pin pops.