I will be replacing those parts as well.
You must (I think) pull the evaporator to replace the TXV. Pretty sure it cannot be accessed from underhood. If you're going that far, may as well replace the evaporator. The only components remaining in the system are the lines, which are trivial to flush at that point. Since you've replaced basically the entire system, you can then just measure how much oil is in the new compressor, and subtract that amount from the system total to figure out how much oil you'll need to add to the rest of the system.
I did the same job on my own '06 TSX two years ago. I replaced the compressor, evaporator, TXV, and condenser. Probably around the same mileage as yours. Mine's now at 276k.
The evaporator was leaking, the TXV was failing, and I had already jerry-rigged the compressor clutch (I replaced the thermal switch in the coil and re-shimmed it) a few years prior. It was time for an overhaul and it's been working great ever since.