@jooize and I worked this out together. I'm sure the details will be modified as we learn, but the model defined by @jooize in the OP is a good start.
NSR liquidity is probably the most important factor in peg strength. As with all crypto assets, liquidity, in and of itself, gives an asset quite a bit of value. By facilitating a second market in NSR, we are supporting the currency pegs as well as enhancing NSR value directly.
It is worth doing. While it is possible to sustain a loss as a market maker, it is unlikely. We should be able to make a tidy profit from the spread, so this activity is self-funding.