Thanks much. To clarify the first question:

Road rings are labeled as outer/middle/inner ... per the position they occupy on the crank. The outer and middle rings have shifting pins/ramps, while the inner ring does not. In this regard, the inner ring seems just like a single speed ring.

So long as the crankarm and ring bcd size matches, can I use an "inner" road chainring as my single speed ring? I'm looking for a 34t or 36t single speed chainring in 130 bcd, and all that's commonly available are "inner" road rings.

Would the inner rings bolt to the crankarm spider in the 'outer' position ... so as to be a single speed ring?