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If I do this I am definitely getting a Marine Electrician to layout the system and parts needed.  I am trying to wrap my head around it to see if my concept is feasible.  To address your points: My thought was that there would be a dedicated charge controller for that battery That would be...

Simon, this is what I was thinking of for the LiFePo battery controller: https://www.renogy.com/12v-20a-dc-to-dc-on-board-battery-charger/   I would connect the existing charging wires from the alternator, solar and 120v battery charger.

I am trying to come up with a better capacity and smaller size for my house battery.  Yes, I am talking about a LiFePo battery.   With regards to the alternator issue, will a dedicated controller for the LiFePo battery solve that issue or do I still need to check for a regulator on the alternator?

Here is a quick sketch of what I think would happen with the wiring.  The input for charging the LiPo would have to be controlled differently than the current setup.  I would also have to run a set of properly sized cables to the windlass battery to be able to have the combining capability with...

Current setup is all lead-acid batteries.  Two Group 27 (Start and Windlass).  One 4D for House load.  All three on a shared charge controller, the start and house are on a 1 - Both - 2 - Off battery switch.  I have solar charging, engine charging and 120VAC charging when plugged in dock side. ...