Coinexchage.io seems receptive to coins like this. YoBit probably would list, they are a popular variety exchange. Maybe livecoin.net? Idk, dev needs to spearhead it if there's any shot.
A social media campaign is also a good idea if there will be any meaningful growth.
Yeah, I looked around a bit and also wondered if YoBit might be a decent option. Unfortunately, it looks like the dev hasn't even been on bitcointalk in over 6 months. I find it quite impressive that the SPN network is still up and running, even if there are only a couple nodes.