Hi,
Lots of us add an additional shore power cord. I have the 30 amp OEM, 20 amp, and 15 amp auxiliary shore power cords. I use simple male and female plugs so I can switch back to the OEM configuration.
Another idea, for shore use items, may be to add a largish inverter that has a dedicated outlet. I have one such outlet installed in the kitchen, so that I can use more than 30 amps for as long as the batteries will run the inverter.
Going to a true 30 amp rewire may require surface mounted wiring which will look not too nice.