Okay, so we decided to try to rise to this challenge. Our first stop was simply to add 10ml Midori to the Difford's recipe for 'Margarita (straight up)'. Despite subsequent fiddling with the balance between the 'sweets' (triple sec, agave syrup and Midori), we concluded that our first stop was the truest. Midori is such a mild liqueur that the Margarita, for us, stood up to the challenge of the additional ingredient. But with the addition of the Midori, we think it worth contemplating going with a Reposado Tequila. We call it a 'Mexican Slipper'.