shouldn't be hard. what backend/hardware are you interested in running this with? i'll add an example for using C++ onnx model. btw check out roadmap, our inference engine will be out 1-2 weeks and it is expected to be faster than onnx.
Added kitten (nano only, for now, will move on to mini) to my "web tts thing": https://github.com/idle-intelligence/tts-web