1.) Sorry, don't know Fox specifics . . yet .

2.) Motorcycle fork oil! Holy cow. ATF? you don't know what weight it is. Motor oil doesn't have the temperature/anti-foaming features that hydraulic oil has. Torco may be fine, but with only light and medium choices, once again, you're shooting in the dark for specific viscosity. M/C fork oil comes in realistic quantities (instead of little foo-foo bicycle shop bottles for inflated prices) and comes in 10w, 20w, etc. and you can easily mix viscosities to achieve 'in-betweens' (i.e. - 50% 10 + 50% 20 to make 15w, etc). Well, now I see that Bel-Ray comes in a liter bottle and is available in 5w, 7w, 10w, 15w & 20w. Go to your local moto shop.

3.) I have a large "bottle brush" that I bought years ago at the auto parts store that is just the right size for cleaning inside lowers. It looks like the one from my Finish Line brush set only way bigger. I'll see if I can find one to post a pic/link.