I have a stock road bike with a threadless headset. I would like to have a more upright position (which would entail higher positioned handlebars) and I was considering my options.

One way to do it is to use an adjustable stem, although my current stem already has a 35 degree angle, so using an adjustable stem and setting it at, let's say, 75 degree, would only give me so much extra handlebar height.

Another way is to replace the whole fork with one that has a longer steerer tube. This option has challenges of its own: I would have to experiment to find a fork that does not alter the frame geometry, and then the paint wouldn't match, etc.

Is there another option, e.g., a steerer tube extender of sorts? I'm thinking an extra 5 or 6 cm (2" or 2.5") would do. Any ideas would be appreciated.