OK appreciate you have to do something about it not working properly, but would suggest anything apart from a direct replacement is a major job for a qualified electrician and is likely to cost substantially more than a straight replacement for little or no gain. Good traditional fused switch panels with that number of circuits will cost nearly as much as and the fuses are already there on the circuit board. If you are just trying to replace the switches, level gauges, mimic and voltmeters that are on the panel it would have to be custom made and that is likely to cost far more than a replacement panel. I have just completely rewired a boat (not a Bavaria) and much simpler with only 16 circuits plus mimic and quotes I had for a custom made panel were around £1000. Standard panels with all the features you need cost close to a replacement 301 and probably need adapting to fit with the existing system. Not sure what else you would want to add to the domestic side that would need an additional distribution panel, but it would not be too difficult to take another feed off the domestic bus bars to a standard distribution panel from a firm like Blue Sea.
Sorry to sound so negative. I had a 2015 boat with a 301 panel and always worried about it, but fortunately in the 6 years I had it there were no problems. However if it had given trouble I would have simply replaced it like for like. While it sounds like a lot of money, it is not in relation to the value of the boat nor in relation to the cost of similar panels from other sources.
