General Electric suggests this circuit in an 80's documentation. The circuit makes use of PUTs that are not common components today. Note the timing components that may change.
A configuration like the one used with the 4013 is also suitable for the 4027. The amount of time...
Mouser Electronics is already providing new MOSFETs EF SIHx28N60EF of Vishay series for voltages...
The 4046 consists in a PLL with na internal oscillator controlled by voltage (VCO). Figure bellow...