Oh look, it's a dain.

[Koen G]

you don't understand the system, no offence meant

Oh, I definitely don't understand the system. But I think if you were to expand the system you propose to a page of Voynichese text, that you would soon have to admit that it is untenable. But I hope I am mistaken and what you propose would actually work. I won't be able to assess that without some more concrete examples though.