Since it looks like you are using the WFCO 120v/12v distribution panel I am fairly certain if you power up the 120v side of the panel the converter will put 13.6 volts onto the DC side. Something will need to be disconnected to disable the converter.
Not sure why you would not just feed the generator side of the OEM transfer switch.
If you want to power just the outlets you can get a small transfer switch to power just the branch circuit(s) with outlets. Although sometimes the branch circuit that feeds the outlets also feeds the converter and fridge. Adjustments for that would have to be made.
