[jclark003]

A rotary switch can be used to replace the MC. I haven’t done it myself but have talked to someone who did. It’s not really that complicated unless you want to keep the ability to have both 30A and 50A shore services simultaneously feed the panel. Otherwise it’s just switching three legs from either of the isolation transformers or generator to the two bus outputs (paralleled). You can also abandon the 30a service and use an automatic A/B switch (just like what switches your bow and stern shore power connections) with the generator on the A side, the 50a isolation transformer on the B side and the output feeding the paralleled bus outputs to the panel.

Before heading down that path have you tried the manual override switch? I had a similar problem to what you are describing and that got me to where I could automatically switch the 50a sources (generator and shore).