Like this?
How are you debouncing the switch?

Probably simple C/R. I'd considered a 1 gate CMOS logic device - but I'd have to scrape up a minimum order charge and think of a load of other stuff I might use eventually to get my moneys worth.

I'm thinking of a text book circuit which I'd have by now if I could remember the search string for Google.

It might only need 1 comparator - but I've got some 393s in SOIC8.

a quad XOR would be easy - but not accommodating an SOIC14.

 

That would seem to be self-inflicted.

Indeed - I clearly didn't make it simple enough for you.

 

Could use flip flop to set address lines on a mux and feed comparators to the mux inputs.

 

Could use flip flop to set address lines on a mux and feed comparators to the mux inputs.

Now let's see you get all that in an SOIC8 and a bunch of resistors...……….