Hi, I think speech sounds good at that age.
I took the dummy off Rory when she was the same age. I didn't mind her having a dummy for sleep, as you say too, but then she started wanting it whenever something upset her, and she'd try and climb the shelf to get to them rather than calm herself, or come to us for cuddles and comfort.
I thought it would be devastating for her, but it went well. After about 4 days she stopped asking for it.
I kept it really simple, just said 'no dummy, all gone, but mummy daddy and puppy are here'. She cried briefly and was sh!tty with me and refused songs but she didn't wake once (god knows how that happened!!). I just kept repeating that she has mummy, daddy and puppy. Fortunately she loves her soft puppy dog so she had a good comfort with her.
I got my DH to take the dummies out to the garage and put them on a shelf I couldn't reach so I wouldn't cave that night!