So update, I called Schroth today and ended up speaking with HMS. They said that so long as the bolt is properly torqued, secured, and supported at both ends, it is acceptable for the rallye brackets to be used in an installation where they pivot. This isn't entirely shocking, as Sector111 worked with HMS to come up with the kit that is offered with the rallye ends on the lap belts.
So I think i'm feeling better about my rallye end lap belt mounts now :-)
"Give a man a match, and he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life."