Dorian Chord Progression: Why It Doesn't Work

Here are the main problems with Dorian circular harmonic scales:

The dominant 7th chord, A7, has a non-modal note, C♯, which removes the “Dorian” sound of the mode. But if you replace C♯ with C or D, you lose the tritone. You also lose the leading tone and the power to establish tonality.
The tonic chord of the “B” relative key is the rootless diminished chord (Bº).
The subdominant of the “F” relative key is the rootless diminished chord.
In both of the possible relative keys, there is a six-semitone span between the roots of two of the chords.