Self nocks are fine, My self Yew bow is 90 lb @ 31 1/2" self nocks ...no problems.
(I usually shoot it as 75@28")
This may sound like some bonkers heresy...but...wait for it...
There is very little strain on the nock of a bow!!
It is all in shear, there is no actual bending moment at the nock...has anyone ever seen a bow fail at the actaual nock???
If you don't believe me push a bit of arrow shaft into a hole in a block of wood clamped in a vice and try to shear it off by putting a string over it, right up close to where the shaft enters the wood and pulling as hard as you can.
Tell us how you get on
Mind if you want to put 4" of ornately carved horn that looks like it's escaped from a chess board on your bows, then go for it
Del