For sure, there are frequencies for balloonists, hang-gliders, and numerous frequencies for gliders, but that is not quite the same. They will all know what to use.  Moreover, none of those frequencies are called "Safetycom" so there is no risk of confusion.  The introduction of the LL frequency has caused a little confusion in some quarters, though it is clear that this is intended as an en-route frequency for flights in Class G below 2000'.  In contrast Safetycom is exclusively for arriving and departing traffic for airfields.  Hopefully the distinction will become clear.