I am sorry grey hawk ,
But I am not familiar with that Buchelle flintlock.
I would have to see a picture of it to maybe know if I ever came across one in any of my builds or repairs in the past.
I don’t do it as a regular project, but I have rebuilt several Cheap Locks to make them function better like putting some kind of bushings in the plate to make the tumbler fit better so it isn’t wobbling around so it stays in contact with the sear better and straightens out the hammer swing.