Just thinking out loud here:
Looking at the few high end casein pens out there, it looks like some casein blanks are more equal than others. The big dogs can pick and chose which to use. I am still undecided as to whether the point of a casein pen is the fact of the material of which it's made, or symmetry of appearance.
I'm thinking a real connoisseur would want both, but if he/she/it had to choose, I believe the fact of the casein would be the point. So I'm not sure the alternate version works unless regularity of the appearance of the lines was more important.
And of course, the narrower the pen - that is, the closer it is turned to the center, the more any irregularities will be less obvious. So, maybe use the real stuff for thinner pens, and the alt for bigger pens?
Anyway, I'll give it a try.
Sometime.