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.
I ran 16" with Conti TS850 on mine and was really happy with the grip and wear. I think some central europe winters are more dry road focused than pure snow winters.
I have also used a lot of the Nokia range over the years and have been happy with price/performance of them as well.
When adding sealant,I find that the best method for me is after adding a thin coat of sealant, lightly tighten the screws finger tight- no tools.
After the sealant cures fully tighten the fasteners, This allows a better thickness of sealant and helps prevents leaks.