Peter
What you are working with in English is an accentual template. Every accentual-syllabic poem in English, whether the meter parallels a classical model or not, is written on some sort of template, usually but not always with a few variations.
If language were coloured pebbles of syllable for a mosaic that would be fine. But language has its own music and to my ear the poetic form must come from the music of the language in question.
Just to be contrary
Janet