hi, is you are in the right place. We can partially answer this question, and might be we can give some valuable suggestions.
On SE K750 we dont have an option like running an application in the background, with which you can achieve such things. Since there is no such api supported to get key strokes and change it before passing it to the OS, we cannot achieve such things. We will anyhow digg into this problem and get back to you, if we have any +ve results.