Michael, TBH in my view this topic does not really shows a sufficient solution. I had thought about all the pros and cons regarding a roll bar in the same way you do it currently.
It is easy to be tempted to spend some money for emotional reasons, to feel saver. I also was short before ordering the Librands bar. It is the only roll bar which looks like it is out of the way in case of a side impact when driving without a helmet because it is placed so far back. Otherwise, as Cain stated, what kind of help will it deliver when you have to consider the survive line must be measured from the top of the cowl.
Mario seems to have chosen the best compromise, drive somehow with care without the rollbar on the road and add a "real" roll bar when going on track or hill climb in combination with a helmet. That said, the Librands track version could be a good solution because the upper half part is easily removable.
BTW this way the type approval issue is also solved as it seems to be impossible to get it under any circumstances for everyday road use but if you want to save your life during a track day you think first about having a protecting and proper roll bar and not about gov. papers.
The residual risk is one of the ingredients why other deny us Mog drivers.
