Universal Remote for Classe SSP25 Pre/Pro

After years of flawless service, my wonderful Classe SSP25 has a minor problem. The remote volume buttons are beginning to be unresponsive. I use it for home theater so the volume gets a robust workout. Not a major issue yet but will be eventually as I have no plans of tossing the processor. I've checked with Classe and they no longer sell the remote but offered to repair with unknown turnaround time and cost.

Therefore, it occurred to me that I may be able to use a universal remote in place of the original. Not being familiar with universals, but having been told by Classe to get a "learning" remote, I am wanting to know if anyone can guide me on recommended devices to purchase. My greater question is how to know if what you're buying will be compatible with the Classe unit??? Also, I don't want to spend much money since I mostly want the controller for on/off and volume control.

Any help will be greatly appreciated.