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The quick and easy way: you could build this little circuit to have up to 8 probe inputs on just one pin. JP1-1..8 are the probe inputs from the machine, JP1-9 is common GND. JP2-1..3 are from UCxx outputs to select input line, JP2-4 goes to UCxx probe input, JP2-5 is UCxx GND, JP2-6 is UCxx pin 26 5V output. (With UC100 you need external 5V.) Before probing you need to output on the 3 selector outputs the address of the input line (Setoutpin, Clroutpin) and then do the same probing as usual. The inputs are pulled up to +5V, the input filter is on the UCxx controller.

you could use any input, and call the probe led with a trigger and look for that or check the input via macro