I think, Flyn, that Withmarsh summed up the problem here,
after RedBull "adjusted them" over 1.5 seconds a lap in Hungary last year:
"In truth, we don't understand it but the FIA has to take a view on what's acceptable. If it is acceptable to get the endplates down, then every millimetre represents about a point of downforce, so 25-30mm of vertical lowering of the endplate is about a second, so it's very substantial.
Do I think flexi wings are right in F1? No, I don't. But I'm not the rule maker or interpreter. So we are asking for a clarification on what is permissible and when we have that we will push to do whatever seems to be allowed."
So, in the end, we talk about money. I mean, money for the continuous effort in another field of research that, please tell me, what's worth for.
I would use some kind of vertical wire or plate that cannot be worn during the race, affixed to the front wing or
something, as previous posters explained (lasers, reflective patches, whatever is simpler and cheaper).