ExpressKeys alternatives for One by Wacom (ctl-672)?

Hello guys,

I bought a used ctl-672 for €20 a few months ago for note-taking and hobby. I was looking for something cheap yet get the feeling of using a graphics tab, and its great for it.

The pen is too slippery (I got sweaty hands, specially when doing Discrete Math study) so I used one of OSU players DIY hack of wrapping the pen with small microfiber cloth for better grip and comfort, IT WORKS!

But now I can't use the only 2 buttons that comes with the tablet. I saw ExpressKeys which gives more button to your graphics tablet. But according to the website it doesn't support ctl-672.

I tried wheels or other on screen shortcuts from Wacom center but I already have laptop with small screen and I would like to avoid onscreen shortcut menu.

Are there any alternative of ExpressKeys I can try? I would like to know if I have any option for it. If its practically not possible, I can save up for some better tablets (please, any recommendations or suggestion are welcome)!

Thanks in advanced!