Reddit reviews Lexip 3DM-PRO Wired USB Mouse - Black

What you may not have noticed is that the mouse itself actually rolls and pitches on its own axis in addition to the mini thumb stick. Very cool, imo. Would probably take some getting used to but I would argue that's true of any control device type you haven't used yet. I think it has a lot of potential. See the Amazon page for images.

Edit: Found a video demo.

The good thing is that if you decide to go to full HOTAS, you have a throttle already, so you can just find a stick to buy standalone, and then you have it.

Additionally, there's also interesting options like this mouse that've come to my attention, too. I'm half tempted to try one out, but at the same time, I'm extremely happy with my current mouse, so I doubt I will.