Right, I've just had the front end off Vikki, looking for options. I thought I could attach something via the old ABS sensor mounting holes (They're tapped to M8)... But no. Looking at it it would just flex as much as the main stays.
I think it's going to have to be (if anything) something welded to the current stays over the flange portion, taking into account the clearances required for the top wishbone.
I'm glad I was poking around the front though - Whilst investigating I found that the lower ball joint on the upright had worked it's way loose, and the steering was acting around the threaded portion of the joint, not the ball!
If I'd left it, and it worked all the way loose at high speed....