You can buy aircon cleaner, I think Wurth make it, it has a very long plastic tube that sprays disinfectant into the evap. unit and cleans it as it drips out the condensate tube.
I would start there.
NIce writeup, I have a new OEM slave to fit to try and cure the slack pedal issue.
I recall someone talking about putting some lube on the release bearing inside the clutch housing that made a big difference.
From memory they used a piece of wire to run some oil down to lube the bearing through...
Do you have any machinists or engineers near you?
You could simply loosen the pipe and trace the shape with a pen, then get it cut by a laser or waterjet cutter.
I can't imagine it would be expensive.
Aluminium and copper washers can be reused by heating them up and cooling them by dunking in water.
It anneals them which makes them soft enough to seal properly again.
I think the OEM hose has some kind of pressure regulation valve inside it, its not just a plain hose.
It will be a MK7 accord if its hydraulic power steering, the Mk8 have electrical power steering.
Have you considered Bilstein B6? They are a better shock than the B4 which are pretty good replacement for standard. Not sure they will be adequate replacement for Type S shock.
I don't think B8 is worth going for imho.
What size wheels will fit over the brake calipers on the front will be the biggest concern.
I purchased a set of 17" for my ATS 2013 for winter use, these clear the calipers on the 320mm discs no problem so you may be able to use 16" wheels.
Personally I would go for a set of cheap alloys oem if...
I am a bit late to this but there is certainly a hitch for a ATS wagon, I have a 2013 and I bought a factory hitch kit complete with template for cutting the bumper.
They are available and should be easily obtained from Honda or NOS suppliers.