You say you never use the inverter so you may not need it. My question is "Why don't you use it?" Firing up a genset to make a cup of coffee or heat leftovers in a microwave seems like a lot of trouble (and noise).
I have no genset so I rely on my inverter quite a bit. I realize I have a different perspective than you but right now, you can repair your inverter/charger for under $10 or spend $500 on a charger and then pay someone to rewire your boat.
When it comes time to sell your boat, that inverter will be a welcome feature to most buyers.
It's your choice of course, but I'm recommending fixing the inverter/charger for $10.
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