A while back, I hosted a tekkit server, I am fairly expierenced with this.
/server main and such would not be possible, I believe, as connecting to the server requires mods and a vanilla server wont allow that, plus Tekkit Classic is 1.2.5, so again, not possible.
However, I do believe I suggested a KZ Tekkit Branch before, and I offer my full assistance.
It's a great idea, tekkit is fun with friends, and KZ is a great place for that.
Though, I enjoy Tekkit Classic over it's 1.5 counterpart, and just to say, I didn't find too many issues with finding plugins for 1.2.5 compatible with Tekkit.