Safe transformerless power supply ?

Welcome to EP.

This circuit is inherently not safe as it is directly connected to mains power!

Do not use this circuit!
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The circuit has some other flaws, too:

• There is no such thing as a 'pnp FET'. The part that would be used here is a MOSFET, either a P-chanel MOSFET (short P-MOSFET) or an N-channel MOSFET (short N-MOSFET).
• When you put the MOSFETs in series, you don't put the gate drivers in series. Rather you conenct each gate driver to one MOSFET.
• It is also meaningles to put the two digital pots at the output in series. Rather you'd put two of them in parallel and connect each 'wiper' to a separate ADC-input of the pic to measure the voltage.
  I don't know why you'd use digital pots in the first place instead of a fixed resistive divider as shown in your first schematic.
  
• The isolator between pic and gate drivers doesn't much to im prove safety. AS the ground of this circuit is common with mains, the pic is not isolated from mains.

Last not least the circuit (both original and your 'improvement') has a fatal flaw. Consider this excerpt from the schematic:

When the upper AC input is negative and the lower AC input is positive, you create a short circuit between the two mains leads via the relay, the bridge rectifier and the common 'ground'.

I repeat: Do not use this circuit.

I recommend not to use any form of non-isolated power supply at all (with exceptions an expert will know how to handle).
I will close this thread to prevent any further mischief.