I am seeking help with my iMac. 

I am an independent Nasdaq day-trader using Trading View as an analytical platform on a daily basis. If it is possible, I would like to reprogram the <kbd>Fn</kbd>
 button (or any other button) on my Apple keyboard that when pressed, it’s initiates a string of letters. 

In this example, I would like it to input the letters: <kbd>⌥ Option</kbd> <kbd>T</kbd> as these (2) buttons are what’s required draw a “trend-line” on the platform.  Instead of me manually having to click on the trend-line or pressing <kbd>⌥ Option</kbd> and <kbd>T</kbd> simultaneously, is there any way I can reprogram the <kbd>Fn</kbd> button on my keyboard so it initiate’s these letters? 

It’s predominately to save time and also because it’s quite awkward pressing the <kbd>⌥ Option</kbd> and <kbd>T</kbd>  buttons together with one hand. I know it’s such a small thing for everyone else, but believe it or not it would be a tremendous help to my workflow.