Is there any character like that?

[oshfdk]

The only way I see an argument like this work, is if it can be demonstrated that the variants are used in different context. That would be a very convincing argument, and an exciting find. Without that, I'm afraid it's just looking at sloppy writing under a microscope.

I agree and I think there is one more caveat: if Voynichese is a ciphertext, the meaning of "context" could be a bit unusual. For example, if the characters are reordered or regrouped, the context for each particular character could be not the characters that immediately precede or follow it.