Is mouthfeel the reason to prefer sucrose? If the whole point of sugar syrup is to add sweetness, then making glucose/fructose syrup instead of sucrose syrup seems like it would be a better idea - unless that viscosity is more important?
Tasty! I reckon it'd be even better with a little less lime, which overwhelms the other ingredients. Will give it a go with 15ml lime juice if I make it again.