I think the Enn'agrammaton is a nice idea, and I agree with @ofshdk that it mostly resembles the Positional Mimic Cipher by @quimqu
The underlying concept in both is to explain the reduced character-based entropy by transferring part of it to an ancillary 'text' (the dots, in your case, 'residuals' in @quimqu's case). I would not exclude at all this possibility, but the problem is to find an encoding mechanism which actually produces a Voynich-like text starting from some text in some language. The search space of possible solutions is enormous.
The underlying concept in both is to explain the reduced character-based entropy by transferring part of it to an ancillary 'text' (the dots, in your case, 'residuals' in @quimqu's case). I would not exclude at all this possibility, but the problem is to find an encoding mechanism which actually produces a Voynich-like text starting from some text in some language. The search space of possible solutions is enormous.