So what is your application? How much output power? Is it battery powered? If so, how long must it last? How much are you willing to pay for the design work? I'm not interested myself but these are the types of questions you'll need to answer.

The second response you cited is reasonable. It can probably be simplified even further by using PWM (although I haven't checked to see how close to the desired frequency PWM can get) and a PIC12F683 and its internal oscillator which costs a bit over a dollar.