been using Technosel seat foam on the race bike for a couple of years now, its stuck onto the Carbon seat unit and has never been a problem.
I also have a GRP seat unit that uses a foam pad. it is good quality fibreglass and is moulded with the supports in the underside of the seating area so that you can add the rubbers pads that you find on the bottom of the original seat, this allows it to distribute the riders weight evenly so as not to stress the fibreglass.

And NO it is not for sale as it will probably be on my road Bip for the track day.