A turn in Highbury

It appears I am Mr Elton,
Though I wish I would be Mr Knightley.
Darling Emma wishes on me
His friend in white denim--Miss Thomas
While stupidly at seven or eight and thirty
I have given away this heart as one of five and ten

Emma with his Taurean insistance
Separates not idea from reality
With ardor and determination quite complicit
Frames around me identity and disposition;

I am afraid Dear Emma,
Your plan to make of me a Mr Elton,
Has created instead on this near empty dancefloor
A recasting of this would be Mr Knightley into one Quite devious-- as that profligate son of Mr Weston.

Would it be that this Knightley-Elton personnage Becomes the friend to whom you turn and love?
Clearly, neither Jason, Jeff nor Gaël Garcia-Bernal,
Were created threescore and seven ago
To be devoted to you, sweet match-making thespian.