It is nice to have both food and toys for agility. (Food for thought, toys for drive) I read an article in Clean Run magazine about how to train a dog for toy drive who doesn't have it naturally. It's a lot of work and takes a lot of patience.
They used clicker training. They also used a non-toy item, such as a glove, to keep the owner from getting over excited about the toy and pushing too hard. First, you begin by c/t for showing interest, then touching, then mouthing or picking up, pulling just a little, pulling a lot, etc.... over many sessions. I wish I had the whole article to share. It was very detailed and provided a schedule. Anyway, you could try a similar approach. Approach tugging as a trick and use clicker training. Just as with any other clicker training, the idea was to take baby steps.