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If not readily available "over the counter", T-tops can be custom made for virtually any boat that can structurally support them. That said, I would caution against installing a T-top on a boat as small as yours. The mass and aerodynamic drag will have a noticeably adverse effect on performance and handling, and if you fish from your Dauntless, you will find that your casting space will be severely restricted.
From a purely aesthetic point of view, I have always thought that T-tops look silly on boats under 19 or 20 feet, but that's just my opinion.
Slather on the sunscreen, buy a good hat, and deploy the bimini if you're really feeling cooked. The Dauntless 15 is a great little boat, but I don't think a T-top would do anything to enhance its many attributes.