Hi Max I have replied to your PM but will post it on here as well for reference.

I did drill and tap the lock stop originally when I had an RVF400 front end fitted which worked okay but because the lock stops are quite narrow you can only use a small diameter bolt. This worked okay but when I dropped it on a track day the bolt bent and the forks dented the tank.

After this I used a Tyga lock stop reducer which just bolts to the lower yolk and worked better in my opinion.