You might give the Hand Laid Track Group at Yahoo a try (http://groups.yahoo.com/group/handlaidtrack/). The Group Moderator hand lays Code 40 in N and Nn3. A lot of great information in the group archives.
Also, Proto:87 Stores (http://www.proto87stores.com/p87stores/ntp.htm) have a lot of supplies, that while for very prototypical HO track, often will work quite well in N. He has exact scale HO spikes, which are smaller than the Micro-Engineering smallest spikes. He has also just introduced some N code 40 supplies, such as tie plates, switch rods, spikes, ties, rail, etc.
There's a lot more of what you are suggesting going on than one realizes because it's not very often captured in the MR mainstream press. Since I took a serious interest in HOn3 a year ago, I've been amazed at how much is available and is going on in the minority scales and interests that you would never know about just reading MR and/or RMC.
A "for instance" was the HOn3 Symposium in Occidental, CA (about 30 miles from where I now live) in June. A great learning experience for my son and me, and I found out about it through the Yahoo HOn3 group.
my thoughts, your choices