I didn't know that either, there would have certainly been enough room for it on a short scale, not so sure, however, if it would have worked on an EB-0L or -3L. And the initial bar bridges were more stable anyway due to the thicker studs and a tighter connenction between studs and bridge. They only tip forward if the studs do due to the wood wearing out, but the later bridges tip forward on the basis of both the wood and their flimsy fastening on the (thinner) studs.
The concept works barely on short scale basses with their limited string pull, but certainly finds its master on long scale basses with their mighty D string pull. But then the long scale versions came out after the evertilt bridges and once they were built, Gibson relatively quickly came up with the three point.