Alps switches can be replaced with other Alps switches only, or new
replicas from Matias.
Replacing full switches requires soldering. There are no hot-swap sockets for Alps.
However, they can also be opened up from the top with tweezers. Then the slider, spring and click leaf could be replaced with those from other Alps switches. I think there has also been group-buys of custom springs.
When they are open, you could also take the opportunity to lube them.
One has to be careful not to mar the plastic too much, and to put the slider back in the right orientation. A trick is to mark one side of the slider with a marker before opening them.