unless you want to upgrade to 50 amp service and redo your main breaker - a very expensive job considering the cost of 50 amp inlets, power cord sets, etc.

In my case I put my "mini panel" behind an access door near the power inlet. Didn't need to cut a hole to install. The access door covers the back of the sailing instruments and engine panel.

IMO the simplest and lowest impact solution is to to put in a completely independent circuit. ABYC may have some requirements like tying the grounds together - I don't know their rules.