Simple Solution For Pitch Trim

Been looking for a way to map the function of Pitch Trim to my Hotas hat switch and the only way I am able to achieve a simple pitch offset is pretty convoluted and I wish there was something as simple as just a pitch trim channel to map to a controller. I did notice that with the mouse I can click and drag the pitch slider and it will hold it's position as a trim, but I can't figure out how to map that slider position change to a joystick axis or button..

My current solution...

1. Map my hat switch up and down buttons to "Slider4 Up and Slider4 Down"
2. Create a Vizzy script that persistently sets Slider1 as a variable by adding and subtracting Slider4 values. This also gives me a visual indicator of the trim setting in the sim.
3. Assign slider3 as my input controller to my elevators (Control surfaces) on the horizontal stabilizers. Can't use a custom input controller because I'm using control surfaces and in career mode which doesn't allow the opening of the tinker panel, so I have to use a third slider.
4. Write a vizzy script that takes the sum of "Pitch" (Joystick pitch axis) and slider1 and sends it to Slider3 to control the elevators of the aircraft.

There has to be an easier way.

Please help..

Cheers