I personally don't think it would be absolutely pointless to beadlock the wheels.   The way i see it is, at least you are guaranteed to not blow that outer bead.  So even if you do blow the inner bead, you just lift the tire off the ground, and apply some pressure and some air, and it will go back on.

I have also seen people weld a bead all around the wheel, which will help keep the tire on.  I have also seen people glue their tires on.

How many normal beadlocked wheels have you seen loose an inner bead (which is where safety bead is located on a normal wheel)?  I've haven't seen very many.  Now on a reversed shell wheel (safety bead is now on the outside) that is beadlocked, you have the non safety bead side of the wheel on the inside.  You'd be loosing inner beads left & right if you ran them at beadlocked pressure. 

I lost an inner bead last Oct.  These are 2.5" backspaced wheels running @ 5-6 psi.