Folding tires with their kevlar beads are less flexible than steel wire, therefore will actually stay better seated and have less of a chance to work off a rim at pressure.
A pic of the Wolber rim cross section would assist in determining if they are safe for any high pressure tire.
Actually, I go just the opposite. I use Kevlar folding tires on hooked bead rims and, for 27" rims with that subtle buldge that's not a true hook, I use wire steel, non-folding tires. There was a significant thread on this in C&V about a year ago, maybe a little longer. One of the BF member regulars on C&V had a blowout due to a kevlar tire coming off the buldge bead. It might have been Cuda2K, but I'm not sure. Others shared their experience. Ever since I read that thread I stopped using Kevlar tires on rims that don't have a true hook bead.