Those 2 things are pretty much exclusive -- In order to perform decently they need good bearings and decent sized optical wheels and a proper size ball - which means they need a good amount of space inside the case so take up quite a bit of room. Perhaps take a look at the layout of your Control panel and eliminate other pieces to make room for it ( ie. don't try to make the Control panel have every part to run every game since each extra piece means less space for others )
A 4-player layout with 8 buttons for players 1 and 2 and 4 buttons for players 3 and 4 and 8 admin buttons doesn't leave a lot of space to add a trackball, spinner(s), etc. even on an aircraft carrier size panel