1. Your neighbor is right. The number of new tools I "need" seems to be directly proportional to the amount of time I spend in the shop.
2. Really strong joints, like mortise/tenon or such, are really only necessary if the design won't allow the use of triangulation to resist racking forces. If you build your router stand in the shape of a closed box, just any old joint will do. The rigidity of the panel will resist racking. Or, you could incorporate X bracing to provide triangle that resist racking.
3. I think you should spend your money for something sexier than yet another joining method.
“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain