For what it's worth, I think I might reinstall the windscreen myself. I watched a few videos on youtube, so now I'm a real expert
. It honestly doesn't look that hard. To get the screen in the right position I'll make up some positioning blocks (maybe 6 blocks). The blocks get lightly fixed in place on the car, maybe with double sided tape. That way you can dry fit the windscreen and fiddle with positioning blocks until happy. You have to prime the windscreen and the recess on the car, then make a nice even bead of urethane with an upside down V shaped profile (that looks like the trickiest part), then with the help of an assistant, push the screen gently into place till it rests on the positioning blocks.
I think it should be possible to make the positioning blocks so that part of the block can be removed after the urethane has dried, if that helps with fitting trim.
I don't plan to use the standard trim. It is too bulky for my taste, and looks to me as though it must disrupt the airflow over the screen. I'll look for something with a lower profile that can be fitted after the screen is bonded in.