I had that problem too, and I came to the solution which is better to use a simple slider, and then apply a custom meterial on it.
In that way you dont need to worry anymore about any keyboard input, plus you can customize a lot more your slider than a simple spinbox.
For example by applying a material on the slider you can also make a gradient effect, and have a different background. So it’s really convient, I repleced all spinbox with my sliders in my app, and it’s working great on desktop and on mobile the annoying keyboard popup is completly disabled.
I saw people overlaying a slider over a spinbox, but that’s really crappy solution, I honestly think having a simple slider and apply a dynamic material on it, it’s the best solution you can get.
Here a video which explain step by step how to make and apply a custom material on a slider:
Good luck with your project 