As bad as a chassis break may be, I think a replacement chassis with the welded in triangulation will be the better option in the long run, than the additional bolt in bracing, that would need a regular spanner check.
I'm sure we all concur, here. There are many people down at the factory with glowing foreheads from slapping them, because they must be rueing the day Charles Morgan opened his mouth at Geneva..
If you're coming down to MMC give us a shout - you could do with a beer..