Have several engineers in group and they say weight is perhaps a show-stopper
Have they considered eating an
oatcake and
peanut butter whenever they feel peckish? It really does work; tastes great and I have lost the equiv. of a GTX330 in the last 2 months
The average UK pilot has the potential to save a whole IFR panel's worth in this way
You could also try the argument that they are invisible to anyone with
one of these (or similar) which is an increasing number of planes nowadays - as well as all commercial ones. A very small risk but not nice when
your number comes up.