There is considerable circumstantial evidence from correspondence by Pollock, Snowden, Linderman, Dubios and several others plus congressional comments and related materials. I have reviewed much - not all - of this and that is the cumulative source of my opinions on the matter. I am currently researching the subject of restrikes of circulation and pattern pieces, and have made some interesting discoveries. Everything will eventually be published. However, a message board is not the appropriate place -- anyway, it wold give away the "punch lines."
Your assumptions are largely at odds with known facts, behavior and purposes. The 20-cent is a good example of a baseless assumption -- Linderman was absolutely clear about his thoughts on the design. (see quote.) Nothing refutes that. Existence of some novodels made at a later date does not change anything Linderman wrote. Collectors of that era were fully aware of the potential for distorting history by restriking coins and patterns, or inventing pre-dated fantasies.