USB-Type C power supply question

[Asparagus]

We are trying to build a custom USB -Type C power supply. The power supply will use USB PD 3.1 specs which means it should be able to work with any device that use the same specs like Google Chromebook, mac book 2016 model, nexus phone 2016 model and many more in the future.


I need to program/reprogram a PD controller chip so that certain PDO's are hidden from the public. During the power delivery negotiation the sink will ask the source what are the available PDO's(power delivery options) in which case the source should respond back with 5, 12, 15 and 20 volts @1,2,3 amps.

 Would it be possible  to send the source a vendor defined message which will open up more options?. For Instance, if the source sees a vendor defined message with id "XYZ12345" it should provide 2 additional PDO's 20volts@4amps, 20volts@5 amps. This logic will have to be programmed into the PD chip on the source side.

According to my research I  can use the chip UPD1001 manufactured by microchip. The manufacturer says that it is configurable but I am not sure if it means that it is reprogrammable.

Please let me know if this is possible?