It is pretty easy to scribe a brace into a plane other than flush with reference, but I've not seen it done historically on this side of the Atlantic.

I've seen but one SR'd barn with centered braces, but it doesn't count, it was commisioned by a wealthy industrialist who returned to his hometown and was atypical from top to bottom. They achieved it by plowing the housing all the way across the face and it is ugly as sin.

If this thread morphed into a discussion on regional variation that might be interesting. I likewise have never seen an unpegged brace here in NNE. Have long tried to research why common purlins are dominant here, and most of the scarfs I know of fall over nothing whatever, but between the braces and are most often bladed abutments or believe it or not, are free tenons, long abbuting bridle joins and a chunk of plank