Kailh Black switches are great for frankenswitch purposes!
Broken-In Kailh Black switches. Breaking in switches helps to reduce scratch, and improve the overall smoothness and consistency. But please keep in mind that breaking-in switches do not 100% remedy all that was mentioned above.
*Broken-In switches are actuated ~600k in a span of roughly 36 hours by machine.
Kailh Black Linear Switches Feature: