No objection to fixing things properly. I'd prefer it. But not if it's
going to require replacing the control panel (it's one membrane all the way
across for 3 fan speeds and 3 light levels) every five years.

Depends if what Sears Parts refers to as Control Panel for $18.99 is all I
need or if I need Control Assembly for $100.49. I guess some disassembly
is indicated to make sure the former is not just some cosmetic thing.
Twenty bucks every so many years would be okay.

No, don't mess it up.

Simply type into Google:

kenmore elite range hood parts

You'll need the model number.

The new switch may not fail as quickly as the original.

Also, you may want to try unplugging or killing power to the unit for
60 seconds. There are computers in the most unlikely places these
days.