I have not. Like I said I just don’t trust them after looking at them. The size of the cross section of an offset key is very small and even stock valve springs, distributors, and standard volume oil pumps put a good amount of force on that key. I was trying to be helpful.
His terminology using lobe sep was wrong that’s all I was saying.
In today's "modern" engines, a key simply locates and is not intended to carry any shear loads. The bolt stretch provides clamp load which creates a joint held in place by friction.
I wouldn't know what our forefathers designed "back in the day" on these old engines. I doubt they used the key to carry shear but I wasn't there (I'm old but not that old!).
I have used offset keys in the past to get a cam degreed where I wanted it. Sometimes an offset key and a tooth off in the other direction - whatever it took to get the proper centerline. I've never had any issues with offset keys but IIRC the most I used was a 4 degree key. FWIW.