Different logic levels on single input
simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. An innocent bystander's interpretation of the question.

It seems that you are trying to describe something as shown in Figure 1. If you can clarify in your question we can proceed from there.







simulate this circuit

Figure 2. A possible solution.

If V1 is high enough to turn on Q1 then the circuit of Figure 2 might suffice. The switch logic will be inverted but this should be easily handled in software.